Cage for cylindrical roller bearing

Abstract

This utility model discloses a cage for a cylindrical roller bearing, comprising a frame body with pockets spaced apart on the frame body. Each pocket group includes a first pocket unit and a second pocket unit. The first pocket unit has a first narrow opening and a first wide opening, located on opposite sides of the frame body and connected by a first connecting surface. The second pocket unit has a second narrow opening and a second wide opening, also located on opposite sides of the frame body and connected by a second connecting surface. The first narrow opening and the second wide opening are located on the same side of the frame body, as are the first wide opening and the second narrow opening. This structural layout is more rational, provides better impact resistance, maintains stable roller position, and ensures normal bearing operation.

Description

Technical Field

[0001] This utility model relates to a cage for a cylindrical roller bearing. Background Technology

[0002] With my country's new energy industry ushering in significant development opportunities, the wind power market is experiencing unprecedented growth. According to the National Energy Administration's plan, by the end of 2030, my country's installed wind power capacity will increase substantially, leading to a sustained rise in market activity. Simultaneously, driven by the national policy of vigorously promoting the localization of core components, the demand for domestically produced wind turbine bearings is becoming increasingly urgent. Many domestic bearing companies are actively entering the wind power market, attempting to break the foreign technological monopoly. However, as market competition intensifies, the negative impacts of price wars are becoming increasingly apparent, leading to frequent bearing failures. Currently, in bearing design, unreasonable cage structure design, such as improper window size and rolling element clearance, can cause abnormal friction between the rolling elements and the cage during operation, accelerating wear. Similarly, an excessively thin cage wall will reduce its load-bearing capacity, failing to effectively guide the rolling elements and disrupting normal bearing operation. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a cage for cylindrical roller bearings with a more rational structural layout, better impact resistance, stable roller position, and guaranteed normal bearing operation.

[0004] To achieve the above objectives, this utility model provides a cage for a cylindrical roller bearing, comprising a frame body with pockets spaced apart on the frame body. The pocket group includes a first pocket unit and a second pocket unit. The first pocket unit has a first narrow opening and a first wide opening, which are respectively located on both sides of the frame body and connected by a first connecting surface. The second pocket unit has a second narrow opening and a second wide opening, which are respectively located on both sides of the frame body and connected by a second connecting surface. The first narrow opening and the second wide opening are located on the same side of the frame body, and the first wide opening and the second narrow opening are located on the same side of the frame body.

[0005] The advantages of this design are as follows: As a preferred option, the cage is made of POM material, whose excellent impact resistance effectively withstands the impact loads generated by frequent start-ups and shutdowns and sudden load changes in the wind turbine, preventing cracks or breakage of the cage due to excessive instantaneous stress. Low wear, low friction, and self-lubricating properties greatly reduce frictional losses between the rolling elements and the cage, not only reducing energy loss but also significantly extending bearing life. Simultaneously, the low friction characteristics result in extremely low frictional noise, meeting the stringent noise requirements of wind power equipment and reducing the difficulty of detecting abnormal noise during equipment maintenance. During the operation of the pitch bearing, a certain number of pockets always face downwards, ensuring the cage is securely fastened to the rollers. This design ensures the stability of the relative position between the cage and the rollers under complex and variable operating conditions. The reasonable clearances on both sides effectively prevent direct contact wear between the raceway and the cage, preventing cage failure due to wear even in harsh environments with high loads and frequent vibrations, thus ensuring the reliable operation of the pitch bearing and improving the overall stability and safety of the wind power equipment.

[0006] As a further feature of this utility model, the first connecting surface includes a first arc-shaped surface and a first flat surface. One end of the first arc-shaped surface is connected to the first narrow opening, and the other end is connected to the first flat surface. The other end of the first flat surface is connected to the first wide opening. The second connecting surface includes a second arc-shaped surface and a second flat surface. One end of the second arc-shaped surface is connected to the second narrow opening, and the other end is connected to the second flat surface. The other two ends of the second flat surface are connected to the second wide opening.

[0007] The beneficial effects of this design are as follows: When the bearing is in operation, the radius of curvature of the arc-shaped surface precisely matches the outer contour of the roller, which can prevent the roller from skewing through surface constraints. Meanwhile, the planar structure restricts the axial displacement of the roller through a rigid support surface. The combined effect of the two ensures that the roller maintains both radial and axial positioning under alternating loads, thus ensuring the positional accuracy of the roller in three-dimensional space.

[0008] As a further feature of this invention, lubrication grooves are provided at intervals on the first arc-shaped surface and the second arc-shaped surface, respectively.

[0009] The beneficial effects of this design are: it effectively stores and delivers lubricating grease. As the rollers roll within the pockets, the grease in the grooves is evenly carried out, continuously covering the contact area between the rollers and the cage. This design avoids localized dry friction caused by uneven grease distribution, ensuring that the roller surface is always in a uniform grease state, thus forming a continuous and stable lubricating film. This lubricating film not only significantly reduces the coefficient of friction and wear, but also buffers the impact between the rollers and the cage. Even under extreme operating conditions such as strong winds and vibrations, it maintains good lubrication, improving the overall reliability and service life of the bearing.

[0010] As a further feature of this invention, the spacing between adjacent pocket groups is the same as the spacing between the first pocket unit and the second pocket unit in the pocket group.

[0011] The benefits of this design are as follows: With identical spacing between adjacent pocket groups and units within each group, the cage experiences uniform stress distribution in the circumferential direction, preventing stress concentration caused by localized spacing differences and improving the overall strength and deformation resistance of the cage structure. During bearing operation, the uniform spacing ensures balanced load transfer between rollers, preventing individual rollers from bearing excessive pressure due to uneven spacing and reducing the risk of abnormal wear. Furthermore, this uniform layout facilitates dimensional control and quality inspection during manufacturing, ensuring cage machining accuracy and guaranteeing stable roller guidance under complex and variable wind power conditions, thus maintaining efficient and reliable bearing operation.

[0012] As a further feature of this utility model, the frame is divided into several sub-frames, and each sub-frame has two sets of pockets.

[0013] The advantages of this design are as follows: This split-frame design divides the cage into several sub-frames, each integrating two sets of pockets to form a four-pocket square structure, greatly improving engineering practicality. The split structure breaks through the processing limitations of traditional integral cages, allowing for modular production to reduce processing difficulty, making it particularly suitable for standardized manufacturing during bulk procurement and significantly shortening the delivery cycle. During installation, the sub-frames are simply spliced ​​along the raceway circumference; no complex positioning is required to form a complete annular cage, greatly simplifying on-site assembly procedures. The four-pocket layout allows each sub-frame to have independent load-bearing capacity. Even if some sub-frames wear out, they can be replaced locally without affecting the overall structure. This plug-and-play design reduces maintenance costs and quickly restores bearing operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the subframe structure in an embodiment of the present invention;

[0015] Figure 2 This is a cross-sectional structural diagram of the subframe in an embodiment of this utility model. Detailed Implementation

[0016] An example of the implementation of the cage of the cylindrical roller bearing of this utility model. Figures 1 to 2As shown: The device includes a frame with pockets spaced apart on it. Each pocket group includes a first pocket unit 2 and a second pocket unit 3. The first pocket unit 2 has a first narrow opening 22 and a first wide opening 21, located on opposite sides of the frame and connected by a first connecting surface. The second pocket unit 3 has a second narrow opening 32 and a second wide opening 31, also located on opposite sides of the frame and connected by a second connecting surface. The first narrow opening 22 and the second wide opening 31 are located on the same side of the frame, as are the first wide opening 21 and the second narrow opening 32. The advantages of this design are as follows: As a preferred option, the cage is made of POM material, whose excellent impact resistance effectively withstands the impact loads generated by frequent start-ups and shutdowns and sudden load changes in the wind turbine, preventing cracks or breakage of the cage due to excessive instantaneous stress. Low wear, low friction, and self-lubricating properties greatly reduce frictional losses between the rolling elements and the cage, not only reducing energy loss but also significantly extending bearing life. Simultaneously, the low friction characteristics result in extremely low frictional noise, meeting the stringent noise requirements of wind power equipment and reducing the difficulty of detecting abnormal noise during equipment maintenance. During the operation of the pitch bearing, a certain number of pockets always face downwards, ensuring the cage is securely fastened to the rollers. This design ensures the stability of the relative position between the cage and the rollers under complex and variable operating conditions. The reasonable clearances on both sides effectively prevent direct contact wear between the raceway and the cage, preventing cage failure due to wear even in harsh environments with high loads and frequent vibrations, thus ensuring the reliable operation of the pitch bearing and improving the overall stability and safety of the wind power equipment.

[0017] As a further feature of this embodiment, the first connecting surface includes a first arcuate surface 23 and a first plane 24. One end of the first arcuate surface 23 is connected to the first narrow opening 22, and the other end is connected to the first plane 24. The other end of the first plane 24 is connected to the first wide opening 21. The second connecting surface includes a second arcuate surface 33 and a second plane 34. One end of the second arcuate surface 33 is connected to the second narrow opening 32, and the other end is connected to the second plane 34. The other two ends of the second plane 34 are connected to the second wide opening 31. The beneficial effect of this configuration is that when the bearing is running, the radius of curvature of the arcuate surface precisely matches the outer contour of the roller, and the curved surface constraint can prevent the roller from skewing. The planar structure restricts the axial displacement of the roller through a rigid support surface. The combined effect of the two ensures that the roller maintains both radial and axial positioning under alternating loads, ensuring the positional accuracy of the roller in three-dimensional space.

[0018] As a further feature of this embodiment, lubrication grooves are respectively provided at intervals on the first arc-shaped surface 23 and the second arc-shaped surface 33. The beneficial effect of this design is that it effectively stores and transports lubricating grease. When the roller rolls within the pocket, the grease in the grooves is evenly carried out, continuously covering the contact area between the roller and the cage. This design avoids localized dry friction caused by uneven grease distribution, ensuring that the roller surface is always in a uniform grease state, thereby forming a continuous and stable lubricating oil film. This lubricating oil film not only significantly reduces the coefficient of friction and wear, but also buffers the impact between the roller and the cage. Even under extreme operating conditions such as strong winds and vibrations, it can maintain good lubrication, improving the overall operational reliability and service life of the bearing.

[0019] As a further feature of this embodiment, the spacing between adjacent pocket groups is the same as the spacing between the first pocket unit and the second pocket unit 3 within the pocket group. The advantages of this arrangement are: With identical spacing between adjacent pocket groups and units within each group, the cage experiences uniform stress distribution in the circumferential direction, preventing stress concentration due to localized spacing differences and improving the overall strength and deformation resistance of the cage structure. During bearing operation, the uniform spacing design ensures balanced load transfer between rollers, preventing individual rollers from bearing excessive pressure due to uneven spacing and reducing the risk of abnormal wear. Furthermore, this uniform layout facilitates dimensional control and quality inspection during manufacturing, ensuring cage machining accuracy and guaranteeing stable roller guidance under complex and variable wind power conditions, maintaining efficient and reliable bearing operation.

[0020] As a further feature of this embodiment, the frame is divided into several sub-frames 1, each sub-frame 1 having two sets of pockets. The advantages of this design are: this split frame design divides the cage into several sub-frames 1, each sub-frame 1 integrating two sets of pockets, forming a four-pocket square structure, greatly improving engineering practicality. The split structure breaks through the processing limitations of traditional integral cages, reducing processing difficulty through modular production, making it particularly suitable for standardized manufacturing during bulk procurement, significantly shortening the supply cycle. During installation, the sub-frames 1 are simply spliced ​​sequentially along the raceway circumference, forming a complete annular cage without complex positioning, greatly simplifying on-site assembly procedures. The four-pocket layout allows each sub-frame 1 to have independent load-bearing capacity; even if some sub-frames 1 wear, they can be replaced locally without affecting the overall structure. This plug-and-play design reduces maintenance costs and quickly restores bearing operation.

[0021] The above examples are merely one preferred embodiment of this utility model. Ordinary variations and substitutions made by those skilled in the art within the scope of this utility model's technical solution are all included within the protection scope of this utility model.

Claims

1. A cage for a cylindrical roller bearing, comprising a cage body, characterized in that: The frame is provided with pocket groups at intervals. The pocket group includes a first pocket unit and a second pocket unit. The first pocket unit is provided with a first narrow opening and a first wide opening. The first narrow opening and the first wide opening are respectively provided on both sides of the frame and are connected by a first connecting surface. The second pocket unit is provided with a second narrow opening and a second wide opening. The second narrow opening and the second wide opening are respectively provided on both sides of the frame and are connected by a second connecting surface. The first narrow opening and the second wide opening are provided on the same side of the frame, and the first wide opening and the second narrow opening are provided on the same side of the frame.

2. The cage of the cylindrical roller bearing according to claim 1, characterized in that: The first connecting surface includes a first arc-shaped surface and a first flat surface. One end of the first arc-shaped surface is connected to the first narrow opening, and the other end is connected to the first flat surface. The other end of the first flat surface is connected to the first wide opening. The second connecting surface includes a second arc-shaped surface and a second flat surface. One end of the second arc-shaped surface is connected to the second narrow opening, and the other end is connected to the second flat surface. The other end of the second flat surface is connected to the second wide opening.

3. The cage of the cylindrical roller bearing according to claim 2, characterized in that: Lubrication grooves are provided at intervals on the first and second arc-shaped surfaces, respectively.

4. The cage of the cylindrical roller bearing according to claim 1, characterized in that: The spacing between adjacent pocket groups is the same as the spacing between the first pocket unit and the second pocket unit in the pocket group.

5. The cage of the cylindrical roller bearing according to claim 1, characterized in that: The frame is divided into several sub-frames, and each sub-frame has two sets of pockets.

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