A steel-plastic composite cage unit

Abstract

This application discloses a steel-plastic composite cage unit, belonging to the field of bearing cages. It is formed by splicing cage beams and cage columns. The cage beam includes a curved plate-shaped outer diameter beam and an inner diameter beam, with the curvature of the outer diameter beam being less than that of the inner diameter beam. The cage column includes an upper column and a lower column, both of which have inner diameter side beam grooves and outer diameter side beam grooves. The outer diameter beam and inner diameter beam are respectively inserted into the outer diameter side beam grooves and inner diameter side beam grooves of the upper and lower columns, and the upper and lower columns are spliced ​​together. The modular design of the cage is achieved through the steel-plastic composite splicing structure. The inner wall of the assembled pocket closely fits the contour of the rolling element, forming a smooth arc contact, effectively improving the guiding accuracy of the rolling element's revolution and rotation, and reducing contact stress and friction loss. This avoids cage cracking, scratches, and assembly damage caused by improper interference fit control, significantly simplifying the assembly process and improving assembly efficiency.

Description

Technical Field

[0001] This application belongs to the field of bearing cages, and particularly relates to a steel-plastic composite cage unit. Background Technology

[0002] Bearings typically consist of an inner ring, an outer ring, rolling elements, and a cage. The cage encloses and separates the rolling elements, ensuring their even distribution between the inner and outer rings, preventing collisions and wear, and guiding the rolling elements to roll stably, thus guaranteeing smooth bearing operation. In large bearings used in wind power applications, for ease of assembly, integral cages often employ a multi-segment circumferential splicing structure. Current technology often uses POM (Polyoxymethylene) injection molding to reduce bearing weight.

[0003] Existing segmented injection-molded cages for wind turbine bearings generally employ a pocket structure combining straight and curved segments. During assembly, the rolling elements are first inserted into the straight segment, and then press-fitted into the working area of ​​the curved segment. The locking force formed at the junction limits the rolling elements, preventing them from dislodging. However, this structure requires draft molding after injection molding, making it difficult to precisely control the locking force. Furthermore, improper control of interference fit during assembly can easily lead to cage cracking, scratches, and other defects. Simultaneously, the junction between the straight and curved segments of the pocket is prone to wear under the axial runout of the rolling elements, causing a continuous increase in axial clearance. In severe cases, this can lead to jamming between the rolling elements and the cage, disrupting normal bearing operation. Moreover, some inverted pocket layouts require extremely high precision in the geometric center position of each pocket. If the machining error exceeds the standard, the rear end face of the cage assembly will tilt relative to the raceway plane, significantly reducing its guiding and limiting effect on the rolling elements. Furthermore, POM material itself is hard and brittle. Under frequent start-stop cycles, alternating loads, and impact loads, stress concentration and cracks easily occur at the root of the cage column, eventually leading to the overall fracture of the cage, which seriously affects the reliability and service life of the bearing. Therefore, the existing technology needs further improvement. Utility Model Content

[0004] This utility model provides a steel-plastic composite cage unit, which solves the problems of difficult-to-control locking amount, easy cracking and scratching, increased gap due to wear at the joint, and the influence of processing errors on the limit or brittle fracture of the material on the wind power segmented injection molded cage, which leads to a decrease in bearing reliability and life.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A steel-plastic composite cage unit includes spliced ​​cage beams and cage columns;

[0007] The retainer beam includes a plate-shaped outer diameter beam and an inner diameter beam with curvature, wherein the curvature of the outer diameter beam is less than that of the inner diameter beam;

[0008] The cage column includes an upper column and a lower column, and both the upper column and the lower column are provided with an inner diameter side beam groove and an outer diameter side beam groove;

[0009] The outer diameter beam and the inner diameter beam are respectively inserted into the outer diameter side beam groove and the inner diameter side beam groove of the upper side column and the lower side column, and the upper side column and the lower side column are spliced ​​together.

[0010] After assembly, the outer diameter beam and the inner diameter beam respectively form the bottom wall and top wall of the pocket in the radial direction, and two adjacent retainer columns form the side wall of the pocket in the circumferential direction. The side of the retainer column facing the pocket is an arc surface, and the geometric center of each pocket is located in the same plane.

[0011] The modular design of the cage is achieved through a steel-plastic composite splicing structure. The inner wall of the assembled pockets closely fits the contour of the rolling elements, forming a smooth, arc-shaped contact. This effectively improves the guiding accuracy of the rolling elements' revolution and rotation, and reduces contact stress and frictional loss. Secondly, the separate plug-in structure of the cage beam and column completely eliminates the vulnerable components related to traditional locking and draft fitting. During assembly, positioning is convenient via the beam slots, eliminating the need for press fitting. This fundamentally avoids cage cracking, scratches, and assembly damage caused by improper interference fit control, significantly simplifying the assembly process and improving assembly efficiency. The coplanar geometric center of all pockets after assembly ensures precise parallelism between the upper and lower end faces of the cage and the bearing raceway plane, completely avoiding cage skew caused by machining errors and significantly enhancing the reliability of limiting and guiding the rolling elements.

[0012] In a preferred embodiment, both the outer diameter beam and the inner diameter beam are plate-shaped metal parts, and both the upper side column and the lower side column are injection-molded parts.

[0013] The steel-plastic composite structure, constructed using plate-like metal components for the outer and inner diameter beams and injection-molded upper and lower side columns, combines lightweight design with high strength. The metal beams, with their excellent tensile and impact resistance, effectively disperse stress on the rollers under alternating and impact loads, significantly enhancing the strength at the column root. The injection-molded upper and lower side columns balance molding precision and manufacturing cost, enabling rapid integrated molding of complex curved surfaces, beam grooves, and locking structures. This complementary steel-plastic combination ensures overall rigidity, fatigue strength, and operational stability of the cage while effectively controlling the total weight, meeting the stringent requirements for lightweight and long-life applications in large wind turbine bearings.

[0014] In a preferred embodiment, reinforcing ribs are provided at the joint between the outer diameter beam and the outer diameter side beam groove, and at the joint between the inner diameter beam and the inner diameter side beam groove; the reinforcing ribs are distributed in a cross shape with the corresponding outer diameter beam or inner diameter beam, and the shapes of the inner diameter side beam groove and the outer diameter side beam groove are adapted to the cross-shaped structure.

[0015] The cross-shaped reinforcing rib design significantly increases the splicing contact area between the beam and column slots, optimizing the single surface contact into a three-dimensional cross-shaped interlocking fit, which significantly improves the structural rigidity and bonding strength of the connection. When the bearing is subjected to alternating and impact loads, the reinforcing rib can evenly distribute the load to the entire base of the cage column, effectively suppressing the risk of cracking, deformation, and loosening caused by stress concentration at the connection, and ensuring the long-term stability and connection reliability of the beam-column splicing structure.

[0016] In a preferred embodiment, the inner diameter beam and the inner diameter side beam groove of the lower column, and the outer diameter beam and the outer diameter side beam groove of the lower column are all interference fit connections; the inner diameter beam and the inner diameter side beam groove of the upper column, and the outer diameter beam and the outer diameter side beam groove of the upper column are all interference fit connections.

[0017] Interference fit can significantly improve the connection tightness and bonding strength between the beam and the column groove, effectively suppressing the relative displacement between the beam and the groove under high-speed operation, alternating load and impact load, and avoiding potential problems such as loose connection and positioning failure.

[0018] In a preferred embodiment, both the upper and lower side pillars have arc-shaped surfaces; after the upper and lower side pillars are joined together, the two arc-shaped surfaces combine to form an arc surface that fits the outer peripheral surface of the rolling element.

[0019] After the upper and lower side pillars are spliced ​​and fixed, the two arc-shaped surfaces fit together seamlessly, forming an arc surface that conforms to the outer periphery of the rolling element. This arc transition structure completely eliminates the sharp intersection and stress concentration between the straight and arc segments in the traditional pocket structure, allowing for a tighter and smoother fit to the outer periphery of the rolling element.

[0020] In a preferred embodiment, the axial end faces of the upper side column and the lower side column are respectively provided with a locking part and a slot that matches the locking part, and the locking part and the slot are arranged radially; after the upper side column and the lower side column are spliced, the locking part of the upper side column is inserted into the slot of the lower side column, and the locking part of the lower side column is inserted into the slot of the upper side column.

[0021] In a preferred embodiment, the locking part includes a columnar claw and a lateral engaging part formed at the upper end of the claw, and the bottom sidewall of the slot is provided with a recess that cooperates with the lateral engaging part; after the locking part is inserted into the slot, the lateral engaging part engages with the recess.

[0022] When the lateral engaging portion moves to the recessed position with the chuck, the chuck elastically resets, allowing the lateral engaging portion and the recess to form a reliable axial and lateral engaging lock, achieving a stable splicing and precise positioning of the upper and lower side pillars. This elastic interlocking structure requires no additional fasteners, is easy and efficient to assemble, and effectively prevents splicing loosening or separation under high-speed bearing operation and alternating loads, significantly improving the connection strength and operational stability of the cage.

[0023] In a preferred implementation, at least two pockets are included; the cage column further includes a first splicing column and a second splicing column that are spliced ​​together, and both the first splicing column and the second splicing column are provided with an inner diameter side beam groove and an outer diameter side beam groove; the upper side column and the lower side column are located at the two ends of the circumferential direction of the cage unit, and the first splicing column and the second splicing column are located at the middle of the circumferential direction of the cage unit.

[0024] In a preferred implementation, the end faces of the upper and lower pillars are provided with a plurality of claws and a plurality of slots, and the claws and slots are configured in pairs.

[0025] By employing a multi-group pair of claws and slots on the upper and lower side column end faces, a uniformly distributed multi-point elastic locking can be formed in the circumferential direction, enabling the upper and lower columns to achieve comprehensive and balanced axial limiting and circumferential fixation after splicing.

[0026] In a preferred embodiment, the axial height of the cage column after splicing is higher than the axial height of the cage beam.

[0027] In a preferred embodiment, the distance between the outer diameter beam and the inner diameter beam after splicing is less than the radial length of the retainer column.

[0028] The above structure has the following beneficial effects:

[0029] The modular design of the cage is achieved through a steel-plastic composite splicing structure. The inner wall of the assembled pockets closely fits the contour of the rolling elements, forming a smooth, arc-shaped contact. This effectively improves the guiding accuracy of the rolling elements' revolution and rotation, and reduces contact stress and frictional loss. Secondly, the separate plug-in structure of the cage beam and column completely eliminates the vulnerable components related to traditional locking and draft fitting. During assembly, positioning is convenient via the beam slots, eliminating the need for press fitting. This fundamentally avoids cage cracking, scratches, and assembly damage caused by improper interference fit control, significantly simplifying the assembly process and improving assembly efficiency. The coplanar geometric center of all pockets after assembly ensures precise parallelism between the upper and lower end faces of the cage and the bearing raceway plane, completely avoiding cage skew caused by machining errors and significantly enhancing the reliability of limiting and guiding the rolling elements. Attached Figure Description

[0030] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain this application and do not constitute an undue limitation of the present invention. In the drawings:

[0031] Figure 1 A three-dimensional structural view illustrating one embodiment of the steel-plastic composite cage unit of this application is shown.

[0032] Figure 2 The diagram illustrates an assembly structure view of one embodiment of the steel-plastic composite cage unit of this application;

[0033] Figure 3 A three-dimensional structural view illustrating a schematic embodiment of the steel-plastic composite cage unit of this application, which conceals the upper side column, is shown.

[0034] Figure 4 A side view of a schematic embodiment of the steel-plastic composite cage unit of this application is illustrated.

[0035] Figure 5 A three-dimensional structural view illustrating a schematic embodiment of the lower left column of the steel-plastic composite cage unit of this application is shown.

[0036] Figure 6 A three-dimensional structural view illustrating one embodiment of the lower column in the steel-plastic composite cage unit of this application is shown.

[0037] Figure 7 The illustration shows a three-dimensional structural view of a schematic embodiment of the lower right column of the steel-plastic composite cage unit of this application;

[0038] Figure 8 A three-dimensional structural view illustrating a schematic embodiment of the steel-plastic composite cage unit with reinforcing ribs on the outer diameter beam is shown.

[0039] Figure 9 The diagram illustrates a schematic structural view of one embodiment of the cooperation between the outer diameter beam and the inner diameter beam of this application and the lower side column and the second splicing column;

[0040] Figure 10 A side view illustrating one embodiment of the steel-plastic composite cage unit of this application is shown.

[0041] Figure 11 It is illustrated Figure 10 A sectional structural view of one schematic embodiment of AA;

[0042] Figure 12 It is illustrated Figure 11 Enlarged structural view of one schematic implementation of Part B;

[0043] Figure 13 An exploded view illustrating an embodiment of the steel-plastic composite cage unit of this application with two pockets is shown.

[0044] Label Explanation:

[0045] 1. Outer diameter beam; 2. Inner diameter beam; 3. Upper side column; 4. Lower side column; 5. Reinforcing rib; 6. Pocket; 60. Arc surface; 30. Inner diameter side beam groove; 31. Outer diameter side beam groove; 32. Arc surface; 33. Claw; 330. Lateral locking part; 34. Slot; 340. Recess; 7. First splicing column; 8. Second splicing column. Detailed Implementation

[0046] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit and scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0047] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In this utility model, unless otherwise expressly specified and limited, the first feature being "upper" or "lower" than the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected through a transitional structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0049] In this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0050] The present invention will now be described with reference to the accompanying drawings.

[0051] The specific solution adopted is as follows:

[0052] like Figure 1-13 As shown, this utility model provides a steel-plastic composite cage unit, which is formed by splicing cage beams and cage columns. The cage beam includes a plate-shaped outer diameter beam 1 and an inner diameter beam 2 with curvature, the curvature of the outer diameter beam 1 being less than that of the inner diameter beam 2. The cage unit of this application is a component of the bearing cage. The assembled cage has an overall ring structure. Both the outer diameter beam 1 and the inner diameter beam 2 are concentric arc-shaped plates. Since the outer diameter beam corresponds to the outer circumference of the cage and is a segment of a larger concentric ring, and the inner diameter beam corresponds to the inner circumference of the cage and is a segment of a smaller concentric ring, under the same central angle, the larger the diameter of the ring, the smaller the curvature of the arc. Therefore, the curvature of the outer diameter beam 1 is less than that of the inner diameter beam 2.

[0053] The retainer column includes an upper column 3 and a lower column 4. Both the upper column 3 and the lower column 4 are provided with an inner diameter side beam groove 30 and an outer diameter side beam groove 31. The outer diameter side beam groove and the inner diameter side beam groove are respectively set as matching arc-shaped contoured groove surfaces. The outer diameter beam and the inner diameter beam are respectively embedded in the corresponding side beam groove in a curvature matching manner to achieve circumferential positioning and fitting assembly. The outer diameter beam 1 and the inner diameter beam 2 are respectively inserted into the outer diameter side beam groove 31 and the inner diameter side beam groove 30 of the upper column 3 and the lower column 4, and the upper column 3 and the lower column 4 are spliced ​​together. After assembly, the outer diameter beam 1 and the inner diameter beam 2 respectively form the bottom wall and the top wall in the radial direction of the pocket 6. Two adjacent retainer columns form the side wall in the circumferential direction of the pocket 6. The side of the retainer column facing the pocket 6 is an arc surface 60 and the geometric center of each pocket 6 is located in the same plane.

[0054] This application adopts a steel-plastic composite splicing structure. Addressing the issues of difficult-to-control locking amount and easy assembly damage, it replaces the traditional one-piece injection molding by using separate insertion of beams and columns. This eliminates the locking structure that easily causes draft errors. During assembly, positioning is achieved simply by precisely inserting the beam into the column's slot, completely avoiding cracking and scratches caused by improper interference fit. To address the issues of wear at the junction and large axial clearance, the inner wall of the pocket 6 is optimized to be a circular arc surface 60, and adjacent cage columns are used as the circumferential sidewalls of the pocket 6. This eliminates the locking junction between straight and curved segments, significantly reducing wear caused by axial runout of the rolling elements and structurally curbing the continuous increase of axial clearance. Simultaneously, the splicing structure, through precise slot matching, ensures that the geometric centers of all pockets 6 are coplanar, effectively preventing cage end face tilting and significantly improving the guiding and limiting stability of the rolling elements.

[0055] During assembly, the lower column 4 is first fixed circumferentially between the inner and outer rings of the bearing. Utilizing the precise positioning of its pre-set inner diameter side beam groove 30 and outer diameter side beam groove 31, it achieves initial engagement with the pre-placed inner diameter beam 2 and outer diameter beam 1, completing the forming and positioning of the lower half of all pockets 6 in one go. Subsequently, the rolling element is placed from the bearing axial direction into the arc pocket 6 formed by the lower column 4, the lower inner diameter beam 2, and the lower outer diameter beam 1. No excessive pressure is required, achieving unobstructed assembly. Finally, the upper column 3, which has the inner diameter side beam groove 30 and the outer diameter side beam groove 31, is axially connected with the lower column 4, so that the upper inner diameter beam 2 and the upper outer diameter beam 1 are simultaneously engaged in their corresponding slots, thus completing the overall assembly.

[0056] The assembly sequence is simple and controllable, significantly improving assembly efficiency and work cycle time. It also fundamentally avoids the risks of cage deformation, cracking, and scratches caused by excessive locking or uneven pressing force in traditional structures. By eliminating easily worn joints and locking structures, the inner walls of the upper and lower pockets 6 formed by the combination of the upper column 3 and lower column 4 are both complete arc transitions, jointly forming a wrap-around arc-shaped cavity. This structure effectively restricts the rollers and ensures smooth operation. Through the smooth contact between the arc surface 60 and the rolling elements, rolling friction is controlled within a reasonable range, completely eliminating the risk of jamming due to excessive local contact stress, achieving a dual improvement in assembly reliability and operational safety.

[0057] In a preferred embodiment of this application, both the outer diameter beam 1 and the inner diameter beam 2 are plate-shaped metal parts, and both the upper side column 3 and the lower side column 4 are injection-molded parts.

[0058] Since the base of the cage column is the core area where stress concentrates during the roller's revolution, rotation, and axial runout, the plate-shaped metal component provides solid rigid support for the base of the column due to its excellent tensile strength and impact toughness. When the bearing is under frequent start-stop, alternating load, or sudden impact load conditions, the metal beam can quickly disperse and transfer local stress, effectively curbing the accumulation and expansion of stress at the base of the column, significantly enhancing the structural strength of the base, and greatly improving the cage's ability to bear alternating and impact loads applied to the roller. This ensures that the cage maintains structural integrity during high-load operation, effectively preventing overall fracture accidents and significantly extending the service life and operational reliability of wind turbine bearings.

[0059] Further, see Figure 3 and Figure 8 The insertion joint of the outer diameter beam 1 and the outer diameter side beam groove 31, and the insertion joint of the inner diameter beam 2 and the inner diameter side beam groove 30 are all provided with reinforcing ribs 5; the reinforcing ribs 5 are distributed in a cross shape with the corresponding outer diameter beam 1 or inner diameter beam 2, and the shapes of the inner diameter side beam groove 30 and the outer diameter side beam groove 31 are adapted to the cross-shaped structure.

[0060] The addition of the cross-shaped reinforcing rib 5 effectively increases the splicing contact area between the beam and the column groove, transforming the original single line or surface contact into a multi-point, multi-directional three-dimensional support. When the bearing is subjected to the revolution, rotation, and axial loads of the rollers, the reinforcing rib 5 can evenly distribute the load transmitted by the beam to the entire column root area, significantly improving the structural rigidity and load-bearing capacity of the connection. This fundamentally reduces the risk of cracking, deformation, or even damage to the injection-molded column due to excessive local stress, effectively ensuring the long-term structural stability and connection reliability of the steel-plastic composite cage.

[0061] In addition, the inner diameter beam 2 and the inner diameter side beam groove 30 of the lower side column 4, and the outer diameter beam 1 and the outer diameter side beam groove 31 of the lower side column 4 are all interference fit connections; the inner diameter beam 2 and the inner diameter side beam groove 30 of the upper side column 3, and the outer diameter beam 1 and the outer diameter side beam groove 31 of the upper side column 3 are all interference fit connections.

[0062] By implementing an interference fit at the insertion joint of the upper and lower side columns 4 and the inner and outer diameter beams 1, the connection tightness and joint strength between the beam and column slots can be significantly improved, effectively suppressing the relative displacement of the beam and slot under high-speed operation, alternating load and impact load, and avoiding potential problems such as loose connection and positioning failure.

[0063] In a preferred embodiment of this application, both the upper side post 3 and the lower side post 4 have arc-shaped surfaces 32, which are arranged symmetrically in a mirror image. When the upper side post 3 and the lower side post 4 are spliced ​​and fixed together, their arc-shaped surfaces 32 can be seamlessly connected, forming a complete arc surface 60 that matches the outer periphery of the rolling element. This structure optimizes the transition between the straight and arc segments of the traditional segmented pocket 6 into a smooth, full-circular transition, which not only allows for a tighter fit to the outer periphery of the rolling element and achieves complete wrapping of the rolling element, but also significantly reduces the wear rate of the sidewall of the pocket 6 and significantly improves the guiding accuracy and operational stability of the cage for the rolling element.

[0064] To achieve locking of the upper column 3 and the lower column 4, in this embodiment, the axial end faces of the upper column 3 and the lower column 4 are respectively provided with locking parts and slots 34 that match the locking parts. When the upper column 3 and the lower column 4 are spliced, the locking part of the upper column 3 is inserted into the slot 34 of the lower column 4, and the locking part of the lower column 4 is inserted into the slot 34 of the upper column 3, thereby achieving positioning and splicing of the two. Without relying on additional connecting parts, the upper and lower columns can be quickly and accurately positioned and axially limited, effectively preventing circumferential slippage or axial separation during bearing operation, enhancing the overall rigidity and connection reliability of the splicing structure. Compared with the traditional bolt structure, this interlocking splicing not only simplifies the assembly process and reduces assembly costs, but also avoids damage to the injection-molded column caused by localized stress concentration by evenly distributing the load, further improving the long-term stability and durability of the cage.

[0065] For details, see Figure 5 , Figure 6 , Figure 7 , Figure 9 and Figure 12 The locking part includes a columnar pawl 33 and a lateral engaging part 330 formed on the upper end of the pawl 33. The bottom side wall of the slot 34 is provided with a recess 340 that mates with the engaging part. When the locking part is inserted into the slot 34, the pawl 33 undergoes elastic deformation and tilts. When the lateral engaging part 330 enters the recess 340, the pawl 33 elastically returns to its original position, so that the engaging part and the recess 340 form a reliable axial and lateral engaging lock. This elastic interlocking structure can achieve quick assembly and tight positioning of the upper and lower side columns 4 without additional fasteners, effectively preventing the bearing from loosening or separating under high-speed operation and alternating loads, and significantly improving the connection strength and operational stability of the cage.

[0066] Furthermore, multiple claws 33 and multiple slots 34 are provided on the end faces of the upper pillar 3 and the lower pillar 4, with the claws 33 and slots 34 configured in pairs.

[0067] During assembly, each claw 33 can be inserted into the corresponding slot 34, forming a multi-point evenly distributed splicing locking structure. This ensures that the upper and lower side columns 4 are evenly limited and fixed in both the circumferential and axial directions, effectively preventing local loosening, circumferential movement, or axial separation of the bearings when operating at high speeds and under alternating loads. This multi-group paired locking structure can evenly distribute the load to multiple areas of the cage end face, significantly improving the overall rigidity and load-bearing capacity of the connection parts. From a structural design perspective, this ensures the reliability and safety of the steel-plastic composite cage for long-term stable operation.

[0068] See Figure 10 As a preferred embodiment of this application, the steel-plastic composite retainer unit includes at least two pockets 6; the retainer column also includes a first splicing column and a second splicing column spliced ​​together, the first splicing column 7 and the second splicing column 8 are both provided with an inner diameter side beam groove 30 and an outer diameter side beam groove 31; the upper side column 3 and the lower side column 4 are located at the two ends of the circumferential direction of the retainer unit, and the first splicing column and the second splicing column are located at the middle of the circumferential direction of the retainer unit.

[0069] The first and second splicing columns in the middle can be mass-produced and their quantities increased or decreased as needed to adapt to different circumferential dimensions, thus forming a pocket. The inner diameter side beam groove 30 and outer diameter side beam groove 31 on the upper side column 3 and the lower side column 4 do not penetrate the circumferential end face, thus avoiding the problem of protruding outer diameter beams or inner diameter beams at the ends. The inner diameter side beam groove 30 and outer diameter side beam groove 31 on the first and second splicing columns are circumferentially connected, providing a smooth installation channel for the inner and outer diameter beams. Moreover, each column is interlocked and fixed with each other by a preset claw and slot structure, forming a stable overall retainer unit after assembly.

[0070] See Figure 1 The axial height of the cage column after splicing is higher than that of the cage beam. This height difference creates an axial limiting space, effectively reducing the actual contact area between the rollers in pocket 6 and the inner and outer raceways of the bearing. This optimizes the contact between the rollers and the raceways from full-face contact to precise local contact, significantly reducing rolling friction resistance and contact stress. While ensuring stable roller operation, this reduces energy loss and wear heat, further improving the operating efficiency and service life of the wind turbine bearing. Simultaneously, the distance between the outer diameter beam 1 and the inner diameter beam 2 after splicing is less than the radial length of the cage column, thereby creating oil storage spaces on both radial sides of the cage beam. During high-speed bearing operation, this effectively stores and guides lubricating oil to the contact area between the rolling elements and pocket 6, forming a stable oil film lubrication layer, significantly reducing friction wear and heat generation. Furthermore, the oil storage space facilitates lubricating oil circulation and heat dissipation, further improving the cage's heat resistance and operational stability, ensuring reliable operation of the wind turbine bearing under long-term, high-load conditions.

[0071] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0072] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A steel-plastic composite retainer unit, characterized in that, This includes spliced ​​cage beams and cage columns; The cage beam includes a plate-shaped outer diameter beam (1) and an inner diameter beam (2) with curvature, wherein the curvature of the outer diameter beam (1) is less than that of the inner diameter beam (2). The retainer column includes an upper column (3) and a lower column (4), and both the upper column (3) and the lower column (4) are provided with an inner diameter side beam groove (30) and an outer diameter side beam groove (31). The outer diameter beam (1) and the inner diameter beam (2) are respectively inserted into the outer diameter side beam groove (31) and the inner diameter side beam groove (30) of the upper side column (3) and the lower side column (4), and the upper side column (3) and the lower side column (4) are spliced ​​together. After assembly, the outer diameter beam (1) and the inner diameter beam (2) respectively form the bottom wall and top wall of the pocket (6) in the radial direction. Two adjacent retainer columns form the side wall of the pocket (6) in the circumferential direction. The side of the retainer column facing the pocket (6) is an arc surface (60) and the geometric center of each pocket (6) is located in the same plane.

2. The steel-plastic composite retainer unit according to claim 1, characterized in that, The outer diameter beam (1) and the inner diameter beam (2) are both plate-shaped metal parts, and the upper side column (3) and the lower side column (4) are both injection-molded parts.

3. The steel-plastic composite retainer unit according to claim 1 or 2, characterized in that, The outer diameter beam (1) and the outer diameter side beam groove (31) are connected together, and the inner diameter beam (2) and the inner diameter side beam groove (30) are connected together. The reinforcing ribs (5) are arranged in a cross shape with the corresponding outer diameter beam (1) or inner diameter beam (2), and the shapes of the inner diameter side beam groove (30) and the outer diameter side beam groove (31) are adapted to the cross-shaped structure.

4. The steel-plastic composite retainer unit according to claim 3, characterized in that, The inner diameter beam (2) and the inner diameter side beam groove (30) of the lower side column (4), and the outer diameter beam (1) and the outer diameter side beam groove (31) of the lower side column (4) are all interference fit connections; the inner diameter beam (2) and the inner diameter side beam groove (30) of the upper side column (3), and the outer diameter beam (1) and the outer diameter side beam groove (31) of the upper side column (3) are all interference fit connections.

5. The steel-plastic composite retainer unit according to claim 1, characterized in that, Both the upper side column (3) and the lower side column (4) have arc-shaped surfaces (32); after the upper side column (3) and the lower side column (4) are joined together, the two arc-shaped surfaces (32) are combined to form an arc surface (60) that is adapted to the outer peripheral surface of the rolling body.

6. The steel-plastic composite retainer unit according to claim 1, characterized in that, The upper side column (3) and the lower side column (4) are respectively provided with a locking part and a slot (34) that matches the locking part. The locking part and the slot (34) are arranged radially. After the upper side column (3) and the lower side column (4) are spliced ​​together, the locking part of the upper side column (3) is inserted into the slot (34) of the lower side column (4), and the locking part of the lower side column (4) is inserted into the slot (34) of the upper side column (3).

7. The steel-plastic composite retainer unit according to claim 6, characterized in that, The locking part includes a columnar claw (33) and a lateral engaging part (330) formed on the upper end of the claw (33). The bottom side wall of the slot (34) is provided with a recess (340) that cooperates with the lateral engaging part (330). After the locking part is inserted into the slot (34), the lateral engaging part (330) engages with the recess (340).

8. The steel-plastic composite retainer unit according to claim 1, characterized in that, Including at least two of the pockets (6); The cage column also includes a first splicing column (7) and a second splicing column (8) that are spliced ​​together. Both the first splicing column and the second splicing column are provided with an inner diameter side beam groove (30) and an outer diameter side beam groove (31). The upper side column (3) and the lower side column (4) are located at the two ends of the circumferential direction of the cage unit, and the first splicing column and the second splicing column are located at the middle of the circumferential direction of the cage unit.

9. The steel-plastic composite retainer unit according to claim 1, characterized in that, The axial height of the cage column after splicing is higher than the axial height of the cage beam.

10. The steel-plastic composite retainer unit according to claim 1, characterized in that, The distance between the outer diameter beam (1) and the inner diameter beam (2) after splicing is less than the radial length of the retainer column.

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