Lightweight long-life high-bearing cyclic roller bearing

Abstract

This application relates to a lightweight, long-life, high-load-bearing recirculating roller bearing, belonging to the field of bearing technology. It includes a front cover plate, a rear cover plate, an inner carrier, a sealing cover, rolling bearings, and connecting parts. The front and rear cover plates are detachably mounted on both sides of the inner carrier. A recirculating guide channel is formed between the front and rear cover plates, the inner carrier, and the sealing cover. The recirculating guide channel includes a sealing portion and an open bearing portion. The rolling bearings fill the recirculating guide channel, and each rolling bearing forms a rolling fit with the inner carrier. When any rolling bearing passes through the open bearing portion, it forms a rolling fit with the telescopic forks. This application features high load-bearing capacity and long service life.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, and in particular to a lightweight, long-life, high-load-bearing cyclic roller bearing. Background Technology

[0002] In the warehousing and logistics industry, with the widespread adoption of automated warehouses and the use of high-rise warehouse racking, space utilization has been greatly improved. Warehouse logistics handling robot systems, which are integrated with warehouses, are also receiving increasing attention. Among these, stacker cranes are a crucial tool in warehouse logistics handling robot systems, and telescopic forks are a component of stacker cranes. The roller bearings supporting the telescopic forks are the most important parts, ensuring the load-bearing capacity of the telescopic forks and improving their smoothness during movement.

[0003] In related technologies, such as Figure 9 The bearing structure shown is a roller bearing commonly used in the market for telescopic forks, which provides support. It includes an inner bearing ring 10, a supporting outer bearing ring 20, and rolling elements 30 disposed between the inner and outer bearing rings 10 and 20. Its mounting structure is as follows: Figure 10 As shown, the system includes a main frame 40 fixedly installed on a stacker crane or a device with telescopic forks, bolted connectors 50 that pass through the main frame 40 in sequence with roller bearings, and connecting nuts 60 that are threadedly connected to the bolted connectors 50. The rollers are arranged in two or three along the telescopic direction of the forks, with a distance of 1-2 mm between the outer diameters of adjacent rollers. The outer ring of the roller bearing is used directly as a support wheel. During use, the roller bearing is subjected to impact loads due to the telescopic forks. Therefore, in order to improve the impact resistance of the roller bearing, the outer ring wall thickness is increased by more than 50% compared to the outer ring wall thickness of traditional solid needle roller bearings or cylindrical roller bearings. This results in a lower rated dynamic load, lower load capacity, and shorter lifespan for the rolling elements in the roller bearing.

[0004] Meanwhile, the requirements for the load capacity and transport speed of telescopic forks are becoming increasingly stringent. However, due to the continuous trend towards lightweight design, the structure and volume of telescopic forks have not changed significantly. This means that the installation space for roller bearings can no longer be increased under today's lightweight requirements. It is impossible to improve the service life of roller bearings by increasing the volume of the rolling elements within them. Furthermore, under the industrial demand for cost reduction and efficiency improvement, the lifespan of roller bearings is becoming increasingly important. Traditional roller bearings are insufficient to meet the future development requirements of telescopic forks and therefore require improvement. Summary of the Invention

[0005] In order to improve the load-bearing capacity and service life of bearings within a limited installation space, this application provides a lightweight, long-life, high-load-bearing cyclic roller bearing.

[0006] The lightweight, long-life, high-load-bearing cyclic roller bearing provided in this application adopts the following technical solution:

[0007] A lightweight, long-life, high-load-bearing cyclic roller bearing includes a front cover plate, a rear cover plate, an inner carrier, a sealing cover, and a rolling bearing body;

[0008] The front cover plate and the rear cover plate are detachably installed on opposite sides of the inner carrier, and the sealing cover is arranged around the periphery of the inner carrier and sealed between the front cover plate and the rear cover plate.

[0009] A circulation guide channel is formed between the front cover plate, the rear cover plate, the inner carrier and the sealing cover, and the circulation guide channel includes a sealing part and an opening bearing part;

[0010] The rolling carrier is provided in multiple forms and is filled in the circulating guide channel. Each rolling carrier forms a rolling engagement with the inner carrier, and each rolling carrier forms a rolling engagement with the telescopic fork when passing through the opening of the circulating guide channel.

[0011] It also includes connectors that allow the inner carrier, front cover plate, and rear cover plate to be detachably fixed to the main frame.

[0012] By adopting the above technical solution, the front cover plate is first installed on the inner carrier. Then, the front cover plate is placed flat on the plane, forming a circulating guide channel with one side open and facing upwards between the front cover plate and the inner carrier. At this time, multiple rolling carriers are arranged in the circulating guide channel with one side open. Next, the rear cover plate is installed on the side of the inner carrier away from the front cover plate, limiting the two sides of the rolling carriers. Then, the sealing cover is installed between the front cover plate and the rear cover plate, thus forming a circulating guide channel, and the rolling carriers fill the circulating guide channel. Finally, the inner carrier, the front cover plate and the rear cover plate are installed on the main frame using the connecting piece. In use, the open bearing part of the circulating guide channel is used to expose the rolling carriers passing through the open bearing part, which can form a rolling engagement with the telescopic forks.

[0013] Compared to traditional sealed needle roller bearings, this invention eliminates the outer ring structure used as the rolling wheel, directly using the rolling bearing to bear the load. Therefore, the diameter Dw of the rolling bearing used in this invention must be larger than the diameter Dw of the needle rollers used in traditional sealed needle roller bearings, possibly by more than twice. Therefore, according to the formula for the rated dynamic load of radial roller bearings: C r =b m f c (iLwe cosα) 7 / 9 Z 3 / 4 Dw 29 / 27 The rated dynamic load of this invention is greater than that of conventional sealed needle roller bearings, and may be increased by more than 100%, according to the basic rated life formula for radial roller bearings: The rated fatigue life of this invention is also greater than that of traditional sealed needle roller bearings of the same specification, possibly by more than 10 times. This can greatly extend the maintenance cycle and reduce maintenance costs. In other words, it does not simply increase the size of the original structure to improve its load-bearing capacity and service life. Moreover, the overall size structure is not increased compared to roller bearings with an outer ring structure, making it suitable for today's lightweight development.

[0014] Meanwhile, this invention uses multiple rolling bearings to evenly bear external loads, so the contact stress on the main frame of the telescopic fork and stacker is less than 50% of the original. Therefore, the lifespan of the main frame of the telescopic fork and stacker can be extended by more than 8 times. In addition, under the same load conditions, this invention has a smaller size, which makes the telescopic fork and stacker smaller and more compact, meeting the development needs of lightweighting.

[0015] Preferably, the connector passes through the front cover plate, the inner carrier and the rear cover plate in sequence, and the end of the connector that passes through is provided with a connecting part that can be detachably connected to the main frame, and the end of the connector away from the end that passes through forms a limiting abutment fit with the inner carrier.

[0016] By adopting the above technical solution, the front cover plate, inner carrier and rear cover plate are sequentially inserted through the connectors, and the limiting abutment cooperation between the connectors and the front cover plate is used. On the one hand, it is convenient to fix the overall structure on the main frame. On the other hand, this insertion installation method can further improve the tightness of the installation between the front cover plate and the inner carrier.

[0017] Preferably, the front cover plate has a first through hole, and the inner carrier and the rear cover plate have second through holes. The diameter of the first through hole is larger than that of the second through hole. The end of the connector away from the through end is provided with a limiting protrusion that fits into the first through hole, and the limiting protrusion abuts against the side of the inner carrier near the front cover plate.

[0018] By adopting the above technical solution, the first through hole on the front cover and the second through hole on the inner carrier form a countersunk hole. The limiting protrusion on the connector can be hidden by the first through hole, saving installation space. In addition, the limiting protrusion is used to achieve limiting contact with the inner carrier, thus achieving the purpose of fastening the installation between the inner carrier and the front cover.

[0019] Preferably, the connecting part is configured as a fixed thread that mates with the thread of the fastening nut, and the connecting part has multi-faceted countersunk grooves at both ends in its through-direction.

[0020] By adopting the above technical solution, the connecting part is set as a fixed thread, so that during actual installation, the connecting part can be installed with the main frame by tightening the nut; in addition, during actual disassembly, the multi-faceted countersunk groove inside the connecting part can be used with the inner wrench to make the connecting part detachable, thereby realizing the detachable installation between the connecting part and the main frame.

[0021] Preferably, the connector has an oil passage groove that communicates with the multi-faceted countersunk groove, and the inner carrier has a connecting groove that communicates with the circulation guide channel and the oil passage groove.

[0022] By adopting the above technical solution, in actual use, in order to improve the smoothness of the rolling bearing body that circulates in the circulating guide channel, lubricating grease can be injected into the oil groove. The lubricating grease will then enter the circulating guide channel from the oil groove and the connecting groove, and play a lubricating role on the rolling bearing body.

[0023] Preferably, a bearing point is formed at the contact point between the outermost radial side of the rolling bearing body of the open bearing portion and the telescopic fork. The sealing cover is provided with protrusions at both ends of the open bearing portion that protrude from the bearing point. The protrusions are elastically arranged and form an abutment seal with the contact surface of the telescopic fork.

[0024] By adopting the above technical solution, the height of the sealing cover at both ends of the opening bearing part is set higher than the bearing point of the rolling bearing body. By utilizing its own elasticity, it achieves abutment seal with the contact surface of the telescopic fork. On the one hand, it prevents external dust and moisture from entering the circulation guide channel. On the other hand, it acts as a scraper to prevent the grease from being carried out of the circulation guide channel as the telescopic fork moves, thus ensuring the lubrication efficiency of the rolling bearing body.

[0025] Preferably, the rolling support is configured as a cylindrical roller, and guide protrusions are provided at both ends of the cylindrical roller along the axial direction. The front cover plate and the rear cover plate are respectively provided with circulation guide grooves in the same direction as the circulation guide channel. The outer circular surface of the cylindrical roller forms a rolling fit with the inner carrier, and the guide protrusions form an embedded fit with the circulation guide grooves.

[0026] By adopting the above technical solution, the bearing area of ​​cylindrical rollers can be greatly increased, and the stability of the cylindrical rollers in the circulating guide channel is greatly improved by the interlocking cooperation between the guide protrusion and the circulating guide groove.

[0027] Preferably, at least two connectors are provided, and the two connectors are spaced apart along the extension and retraction direction of the telescopic forks.

[0028] By adopting the above technical solution, at least two connectors are provided, thereby improving the stability of the front cover, inner carrier and rear cover on the main frame.

[0029] Preferably, there is one connector, and the connector is a circular shaft.

[0030] By adopting the above technical solution, the connector is set as one and is arranged as a circular shaft, so that the front cover plate, inner carrier and rear cover plate that are fixedly connected to each other can rotate relative to the connector. This makes it easier to adjust the angle between the opening bearing part and the contact surface of the telescopic fork, which helps to ensure the fit between the opening bearing part and the telescopic fork.

[0031] Preferably, the circulating guide channel is arranged in a straight line at the opening support portion, and the straight-lined opening support portion is parallel to the extension and retraction direction of the telescopic fork.

[0032] By adopting the above technical solution, the circulating guide channel is set in a straight line at the opening bearing part, and the straight opening bearing part is parallel to the extension direction of the telescopic fork. This greatly increases the bearing area of ​​the bearing structure on the telescopic fork, thereby improving the overall load-bearing capacity and service life.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. The diameter of the rolling bearing body in this application is larger than the diameter of the needle roller in a traditional roller bearing, which increases the rated fatigue life by more than 10 times compared with the traditional needle roller bearing of the same specification, greatly extending the maintenance cycle and reducing maintenance costs;

[0035] 2. This application uses multiple rolling bearings to bear the external load evenly, which greatly reduces the contact stress and has a smaller volume, meeting the current development needs of lightweighting;

[0036] 3. By setting the sealing cover, on the one hand, it plays a role in limiting the rolling bearing body, and on the other hand, the protruding parts at both ends of the open bearing part are elastically set to achieve a tight abutment with the telescopic fork. This can prevent external dust and moisture from entering the circulation guide channel, and also prevent the lubricating grease in the circulation guide channel from leaking out from the circulation guide channel, thus reducing the amount of lubricating grease used and making use of the lubricating grease.

[0037] 4. This application improves load-bearing capacity and service life while significantly reducing overall size, material costs, and overall weight;

[0038] 5. The use of lubricating grease serves two purposes: lubrication and noise reduction. This allows the bearing to run smoothly and also helps to achieve noiseless operation.

[0039] 6. By utilizing the internal carrier, the rigidity and economy of the overall structure are improved, thereby extending the service life of the entire bearing system by increasing rigidity. Attached Figure Description

[0040] Figure 1 This is an isometric schematic diagram of the overall structure of a lightweight, long-life, high-load-bearing cyclic roller bearing, which is the main feature of Embodiment 1 of this application.

[0041] Figure 2 This is an exploded view of Embodiment 1 of this application, which mainly illustrates the lightweight, long-life, high-load-bearing cyclic roller bearing structure.

[0042] Figure 3 This is a schematic diagram illustrating the structure of the storage space formed between the front cover plate, the inner carrier, and the rear cover plate, which is the main embodiment of this application.

[0043] Figure 4 This is a cross-sectional view of Embodiment 1 of this application, which mainly illustrates the structure of a lightweight, long-life, high-load-bearing cyclic roller bearing.

[0044] Figure 5 This is a cross-sectional view of Embodiment 2 of this application, which mainly illustrates the lightweight, long-life, high-load-bearing cyclic roller bearing structure.

[0045] Figure 6 This is a cross-sectional view of the overall structure of the support structure for telescopic forks, which is the main embodiment of this application.

[0046] Figure 7 This is a schematic diagram illustrating the overall assembly of the support structure for telescopic forks, which is the main embodiment of this application.

[0047] Figure 8 This is a schematic diagram illustrating the support structure formed by roller bearings in the related art, which is the main embodiment of this application.

[0048] Figure 9 This is a cross-sectional schematic diagram of a bearing structure in related technologies.

[0049] Figure 10 This is a schematic diagram of the installation structure between the bearing structure and the main frame in related technologies.

[0050] Reference numerals: 1. Bearing body; 11. Front cover plate; 111. First through hole; 12. Rear cover plate; 121. Circulation guide groove; 13. Inner carrier; 131. Second through hole; 132. Connecting groove; 14. Sealing cover; 15. Rolling bearing body; 151. Guide protrusion; 2. Connecting part; 21. Limiting protrusion; 22. Smooth rod part; 23. Connecting part; 24. Multi-faceted countersunk groove; 25. Oil groove; 251. First oil groove; 252. Second oil groove; 3. Storage space; 4. Circulation guide channel; 41. Sealing part; 42. Open bearing part; 5. Bearing point; 6. Protrusion; 7. Main frame. Detailed Implementation

[0051] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0052] This application discloses a lightweight, long-life, high-load-bearing cyclic roller bearing.

[0053] Example 1

[0054] Reference Figure 1 and Figure 2 The lightweight, long-life, high-load-bearing recirculating roller bearing includes a bearing body 1 and a connecting member 2. The connecting member 2 is detachably connected to the bearing body 1, and is also detachably and fixedly connected to the main frame of a stacker crane or other machine or equipment with a telescopic fork structure. This main frame is a frame structure fixedly installed on the stacker crane or other machine or equipment. The bearing body 1 can be detachably and fixed to the main frame of the stacker crane or other machine or equipment with a telescopic fork structure using the connecting member 2.

[0055] Reference Figure 2 and Figure 3 The bearing body 1 includes a front cover plate 11, a rear cover plate 12, an inner carrier 13, and a sealing cover 14. The front cover plate 11 and the rear cover plate 12 are detachably installed on opposite sides of the inner carrier 13, i.e., on opposite sides in the thickness direction, using fastening screws. The front cover plate 11 and the rear cover plate 12 have the same area and are both larger than the side area in the thickness direction of the inner carrier 13. The opposite sides of the front cover plate 11 and the rear cover plate 12 form a storage space 3 for storing the rolling bearing 15 between them and the outer edge of the inner carrier 13.

[0056] Reference Figure 3 and Figure 4The sealing cover 14 is made of metal or rubber and is arranged around the periphery of the inner carrier 13 along the outer edge trajectory of the front cover plate 11 and the rear cover plate 12. The two sides of the sealing cover 14 are sealed with sealant at the outer edge between the front cover plate 11 and the rear cover plate 12. That is, the sealing cover 14 is arranged around the periphery of the storage space 3, so that a circulation guide channel 4 is formed between the storage space 3 between the front cover plate 11, the rear cover plate 12 and the inner carrier 13 and the sealing cover 14. The circulation guide channel 4 includes a sealing part 41 and an open bearing part 42.

[0057] Reference Figure 2 and Figure 4 The bearing body 1 also includes rolling bearings 15. Multiple rolling bearings 15 are provided and are all filled in the circulation guide channel 4. In this embodiment, each rolling bearing 15 is a cylindrical roller, and each rolling bearing 15 has guide protrusions 151 integrally formed at both ends of its axial direction. Correspondingly, the front cover plate 11 and the rear cover plate 12 are provided with circulation guide grooves 121 on the side that are close to each other, which are in the same circulation direction as the circulation guide channel 4. The outer circular surface of each cylindrical roller forms a rolling fit with the side wall of the inner carrier 13 perpendicular to its thickness direction, and the guide protrusions 151 at both ends of the axial direction of each cylindrical roller form an embedded fit with the circulation guide grooves 121 on the front cover plate 11 and the rear cover plate 12, thereby ensuring the stability of the cylindrical roller's movement in the circulation guide channel 4.

[0058] Reference Figure 1 and Figure 4 In this embodiment of the application, the front cover plate 11, the inner carrier 13, the rear cover plate 12, and the circulation guide channel 4 are all arranged in a trapezoidal shape. The open bearing portion 42 is arranged on the long side of the trapezoidal shape and is parallel to the extension direction of the telescopic fork. That is, the open bearing portion 42 is arranged in a straight line, which increases its bearing area. When the rolling bearing body 15 is located in the open bearing portion 42 of the circulation guide channel 4, the rolling bearing body 15 and the telescopic fork form a rolling engagement, and at the same time play the role of bearing the telescopic fork.

[0059] In this embodiment, the rolling bearing 15 is directly used as the load-bearing component that contacts and engages with the telescopic fork. Compared to the needle roller bearings commonly used in the prior art, the outer ring structure used as the rolling wheel is eliminated. Therefore, the diameter Dw of the rolling bearing 15 in this application embodiment is larger than the diameter Dw of the needle rollers used in traditional needle roller bearings, and can be more than twice as large. Therefore, according to the formula for the rated dynamic load of a radial roller bearing: C r =b m f c (iL we cosα) 7 / 9 Z 3 / 4 Dw 29 / 27This invention can increase the rated dynamic load of traditional sealed needle roller bearings by more than 100%, according to the basic rated life formula for radial roller bearings: The rated fatigue life of the present invention can be increased by more than 10 times compared with the traditional sealed needle roller bearing of the same specification, which can greatly extend the maintenance cycle and reduce maintenance costs.

[0060] Meanwhile, the present invention uses multiple rolling bearings 15 to bear the external load evenly, so the contact stress between the telescopic fork and the main frame is less than 50% of the original, thus extending the life of the telescopic fork and the main frame by more than 8 times. In addition, under the same load conditions, the present invention has a smaller size, so that the telescopic fork and the stacker can also be made smaller and more compact, meeting the development of lightweighting.

[0061] Reference Figure 2 and Figure 4 The connecting member 2 is configured as a connecting bolt, i.e., a cylindrical shaft. The connecting bolt includes a limiting protrusion 21, a smooth rod portion 22, and a connecting portion 23 that is detachably connected to the main frame. The front cover plate 11 has two first through holes 111 spaced apart along the extension direction of the telescopic fork. Similarly, the inner carrier 13 and the rear cover plate 12 have two second through holes 131 spaced apart along the extension direction parallel to the telescopic fork. The two first through holes 111 and the two second through holes 131 correspond to each other, and the corresponding first through holes 111 and second through holes 131 are coaxially arranged. The axis of any first through hole 111 and second through hole 131 is perpendicular to the extension direction of the telescopic fork. There are two connecting bolts. Since the structure of any connecting bolt and the connection method with the bearing body 1 are the same, the connection method between one connecting bolt and the bearing body 1 will be described as an example.

[0062] Reference Figure 2 and Figure 4 The connecting bolts pass sequentially through the first through hole 111 on the front cover plate 11 and the second through holes 131 on the inner carrier 13 and the rear cover plate 12 via the connecting part 23. The limiting protrusion 21 of the connecting bolts forms an embedded fit with the first through hole 111 on the front cover plate 11, i.e., a countersunk hole is formed between the first through hole 111 and the second through hole 131. This allows the limiting protrusion 21 of the connecting bolts to not only limit the front cover plate 11 but also form a tight fit with the inner carrier 13, which is beneficial for fixing the front cover plate 11 and the inner carrier 13. The inner carrier 13 and the rear cover plate 12 are both located at the position of the smooth part 22 of the connecting bolts.

[0063] Reference Figure 2The connecting bolt shaft connection part 23 is configured with a fixed thread, and both ends of the connecting bolt in the axial direction are provided with multi-faceted countersunk grooves 24. In this embodiment, the multi-faceted countersunk grooves 24 are configured as internal hexagon countersunk grooves. With the help of an internal hexagon wrench, the threaded connection between the fixed thread and the fastening nut can be realized at both ends of the connecting bolt in the axial direction.

[0064] Reference Figure 2 and Figure 4 The connecting bolt has an oil passage groove 25 that communicates with the multi-faceted countersunk groove 24. The oil passage groove 25 includes a first oil passage 251 that is parallel to the axial direction of the connecting bolt and a second oil passage 252 that is perpendicular to the first oil passage 251. The inner carrier 13 has a connecting groove 132 at the other opening end corresponding to the second oil passage 252. The connecting groove 132 is connected to the circulation guide channel 4, and the connecting part of the connecting groove 132 is vertically upward.

[0065] In actual use, the staff injects lubricating grease into the oil channel 25 through the oil injection equipment. The grease will be injected from the first oil channel 251 into the second oil channel 252, until it enters the circulation guide channel 4, which will lubricate the rolling bearing 15.

[0066] In other embodiments, the distance between the two connecting bolts can be adjusted according to the operating conditions to adapt to different usage requirements.

[0067] Reference Figure 4 Since the outermost radial contact point between the rolling bearing body 15 located in the opening bearing portion 42 and the telescopic fork forms a bearing point 5, in order to prevent lubricating grease from overflowing from the opening bearing portion 42, the sealing cover 14 is provided with protrusions 6 at both ends of the opening bearing portion 42 that protrude from the bearing point 5. The protrusions 6 are elastically provided and form an abutment seal with the contact surface of the telescopic fork. The protrusion height of the sealing cover 14 is set to 1mm to prevent the resistance generated by friction and to achieve a good abutment seal effect.

[0068] The implementation principle of a lightweight, long-life, high-load-bearing cyclic roller bearing in this application embodiment is as follows:

[0069] In the actual installation process, the front cover plate 11 is first fixed to the inner carrier 13 using fastening screws. Then, the front cover plate 11 is laid flat on the plane so that the inner carrier 13 faces upward. Then, the corresponding number of rolling carriers 15 are placed one by one in the storage space 3 formed between the front cover plate 11 and the inner carrier 13, and the guide protrusion 151 of each rolling carrier 15 is embedded in the circulation guide groove 121 on the front cover plate 11.

[0070] Then, the rear cover plate 12 is fixed to the inner carrier 13 on the side away from the front cover plate 11 using fastening screws. During the fixing process, the guide protrusion 151 at the other end of the rolling carrier 15 is ensured to form an embedded fit with the circulation guide groove 121 on the rear cover plate 12. Next, the sealing cover 14 is sealed and connected between the front cover plate 11 and the rear cover plate 12 along the outer edge trajectory of the front cover plate 11 and the rear cover plate 12 using sealant, forming an open bearing part 42 and a sealing part 41. During the sealing connection process, the open bearing part 42 is ensured to be located on the long side of the front cover plate 11 and the rear cover plate 12.

[0071] Finally, the two connecting bolts are sequentially inserted into the first through hole 111 and the second through hole 131 of the bearing body 1, and the fixing threads of the two connecting bolts are inserted through the main frame and connected with the threaded connection of the fastening nut to fasten the bearing body 1 to the main frame.

[0072] Example 2

[0073] Reference Figure 5 The difference between this embodiment and Embodiment 1 is that...

[0074] The connector 2 is set to one, that is, the connecting bolt is set to one. In this embodiment of the application, the bearing body 1 formed by the front cover plate 11, the inner carrier 13, the rear cover plate 12 and the sealing cover 14 is arranged in an isosceles triangle, and the opening bearing part 42 of the bearing body 1 is set at the bottom edge of the bearing body 1.

[0075] During actual installation, the bearing body 1 can rotate relative to the connecting bolts and the installer can adjust the fit between the bearing body 1 opening bearing portion 42 and the contact surface of the telescopic fork. Therefore, during actual installation, the staff can assemble multiple lightweight, long-life, high-load-bearing cyclic roller bearings of this application embodiment on the main frame according to the working conditions, so as to achieve a variety of combinations.

[0076] This application also discloses a support structure for telescopic forks.

[0077] Reference Figure 6 and Figure 7 The support structure for the telescopic fork includes the main frame 7 in the above-mentioned application embodiment and two lightweight, long-life, high-load-bearing recirculating roller bearings disclosed in the above-mentioned application embodiment 2. The two lightweight, long-life, high-load-bearing recirculating roller bearings are installed at intervals on the main frame 7 along the telescopic direction parallel to the telescopic fork.

[0078] Reference Figure 6 and Figure 7In the actual installation process, after the bearing body 1 is assembled, the connecting bolts are passed through the bearing body 1 and then through the main frame 7. The connecting bolts are tightened with the threaded part to fix the bearing body 1 to the main frame 7. However, before tightening the fastening nut, the operator can rotate the bearing body 1 to adjust the fit between the open bearing part 42 on the bearing body 1 and the contact surface of the telescopic fork. Alternatively, one bearing body 1 can be pre-fixed. When the other bearing body 1 is fixed by another connecting bolt, since two points determine a straight line, while bearing the telescopic fork, the fit between the two bearing bodies 1 and the contact surface of the telescopic fork can be adjusted by rotation.

[0079] If reference Figure 8 The roller bearings in the related technology are installed on the main frame to form a support structure. Although the roller bearings in the related technology are single-axis, in order to improve the load-bearing strength of the support structure, it is necessary to increase the number of roller bearings installed. In actual use, compared with the embodiment of this application, the support structure requires at least 3 roller bearings to be installed under the same load. Once the number of roller bearings is greater than 2, in order to ensure that each roller bearing can play a load-bearing function, the staff needs to spend more time adjusting the position of the third roller bearing, which is equivalent to the other two roller bearings, thus increasing the overall installation and adjustment time.

[0080] Using the embodiments of this application, there is no need for additional personnel to install other components for adjusting the straightness of the two bearing bodies 1, which reduces costs and facilitates overall installation and adjustment, so as to achieve the average force on the bearing and help to improve its service life.

[0081] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lightweight, long-life, high-load-bearing cyclic roller bearing, characterized in that: It includes a front cover plate (11), a rear cover plate (12), an inner carrier (13), a sealing cover (14), and a rolling carrier (15). The front cover plate (11) and the rear cover plate (12) are detachably installed on opposite sides of the inner carrier (13), and the sealing cover (14) surrounds the periphery of the inner carrier (13) and is sealed between the front cover plate (11) and the rear cover plate (12). A circulation guide channel (4) is formed between the front cover plate (11), the rear cover plate (12), the inner carrier (13) and the sealing cover (14), and the circulation guide channel (4) includes a sealing part (41) and an opening bearing part (42). The rolling carrier (15) is provided in multiple ways and is filled in the circulation guide channel (4). Each of the rolling carriers (15) forms a rolling fit with the inner carrier (13), and when each of the rolling carriers (15) passes through the opening bearing part (42) of the circulation guide channel (4), it forms a rolling fit with the telescopic fork. It also includes a connector (2) that detachably fixes the inner carrier (13), the front cover plate (11) and the rear cover plate (12) to the main frame. The outermost radial contact point between the rolling bearing body (15) located in the open bearing portion (42) and the telescopic fork forms a bearing point (5). The sealing cover (14) is provided with protrusions (6) at both ends of the open bearing portion (42) that protrude from the bearing point (5). The protrusions (6) are elastically provided and form an abutment seal with the contact surface of the telescopic fork. The connector (2) passes through the front cover plate (11), the inner carrier (13) and the rear cover plate (12) in sequence, and the end of the connector (2) is provided with a connecting part (23) that can be detachably connected to the main frame (7). The end of the connector (2) away from the end of the connector (2) forms a limiting abutment fit with the inner carrier (13). The front cover plate (11) is provided with a first through hole (111), and the inner carrier (13) and the rear cover plate (12) are provided with a second through hole (131). The diameter of the first through hole (111) is larger than that of the second through hole (131). The end of the connector (2) away from the through end is provided with a limiting protrusion (21) that forms an embedded fit with the first through hole (111). The limiting protrusion (21) abuts against the side of the inner carrier (13) near the front cover plate (11).

2. The lightweight, long-life, high-load-bearing cyclic roller bearing according to claim 1, characterized in that: The connecting part (23) is configured with a fixed thread that engages with the thread of the fastening nut, and the connecting part (2) has multi-faceted countersunk grooves (24) at both ends in its through-direction.

3. The lightweight, long-life, high-load-bearing cyclic roller bearing according to claim 2, characterized in that: The connector (2) has an oil passage groove (25) that communicates with the multi-faceted countersunk groove (24), and the inner carrier (13) has a connecting groove (132) that communicates with the circulation guide channel (4) and the oil passage groove (25).

4. The lightweight, long-life, high-load-bearing cyclic roller bearing according to claim 1, characterized in that: The rolling support (15) is configured as a cylindrical roller, and guide protrusions (151) are provided at both ends of the cylindrical roller in the axial direction. The front cover plate (11) and the rear cover plate (12) are respectively provided with circulation guide grooves (121) in the same circulation direction as the circulation guide channel (4). The outer circular surface of the cylindrical roller forms a rolling fit with the inner carrier (13), and the guide protrusions (151) and the circulation guide grooves (121) form an embedded fit.

5. A lightweight, long-life, high-load-bearing cyclic roller bearing according to claim 1, characterized in that: At least two connectors (2) are provided, and the two connectors (2) are spaced apart along the extension and retraction direction of the telescopic fork.

6. The lightweight, long-life, high-load-bearing cyclic roller bearing according to claim 1, characterized in that: One connector (2) is provided, and the connector (2) is a circular shaft.

7. The lightweight, long-life, high-load-bearing cyclic roller bearing according to claim 1, characterized in that: The circulating guide channel (4) is located in a straight line at the opening support part (42), and the straight opening support part (42) is parallel to the extension and retraction direction of the telescopic fork.

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