Split bearing cage and method of manufacturing the same

Abstract

The present application relates to the technical field of bearing retainer, disclose a kind of split type bearing retainer and its manufacturing method, including multiple first sub-section and second sub-section, first sub-section and second sub-section are arranged along the circumferential staggered and fixedly connected;Two first sub-sections between adjacent are pocket, the corresponding location of pocket of second sub-section, constitute the axial side wall of pocket;The material of first sub-section and second sub-section is different, and the structural strength of second sub-section is greater than the structural strength of first sub-section;The material of second sub-section and first sub-section that form the axial side wall of pocket is differentiated in the present application, so that the structural strength of second sub-section in retainer constituting the axial side wall of pocket is greater than the structural strength of first sub-section, realizes the structural strength promotion of retainer pocket bottom wall, can reduce the probability of retainer damage.

Description

Technical Field

[0001] This invention relates to the field of bearing cage technology, and in particular to a split bearing cage and its manufacturing method. Background Technology

[0002] The structure of a rolling bearing mainly consists of four parts: an inner ring, an outer ring, rolling elements, and a cage. The core function of the cage is to evenly separate and constrain the rolling elements between the inner and outer rings, preventing them from contacting, colliding, and wearing each other. This has a crucial impact on the bearing's limiting speed, operational smoothness, and service life.

[0003] Deep groove ball bearing cages can be classified into two types based on their material: metal cages and plastic cages. Among them, injection-molded cages have gradually become the mainstream choice for high-speed bearings due to their advantages such as high molding precision, good self-lubrication, and low cost. However, when the bearing is operating at high speed, the cage rotates at high speed along with the rolling elements. The centrifugal force generated by its own mass becomes the main load source, causing the cage to be under tension and generating tensile stress along the circumferential direction, which can easily lead to cage deformation. The higher the bearing speed, the greater the centrifugal force on the cage, the more significantly the internal stress level of the cage increases, and the degree of deformation is further aggravated.

[0004] The pocket structure of injection-molded cages is a sensitive area of ​​stress concentration. To adapt to the shape of the rolling elements and achieve effective constraint, the bottom wall (axial sidewall) of the pocket is usually designed as a thin arc or planar structure. Under the circumferential tension and deformation caused by high-speed centrifugal force, the stress concentration effect of the bottom wall of the pocket is further amplified, becoming a weak point in the cage's mechanics. Actual operating condition verification shows that the failure fracture of injection-molded cages in high-speed bearings is almost always concentrated at the bottom wall of the pocket. The fracture mode is mostly circumferential tearing or fatigue cracking, which directly leads to cage disintegration, rolling element disorder, and ultimately serious failures such as bearing seizure and burnout.

[0005] In existing technologies, optimization of the high-speed performance of injection molded cages is mostly limited to material modification (such as increasing the glass fiber content to improve strength) or fine-tuning of the pocket shape. Although these can alleviate the stress concentration problem to some extent, they do not fundamentally solve the contradiction between the weak structure at the bottom of the pocket and the high-speed centrifugal load, making it difficult to meet the increasingly stringent requirements of ultra-high-speed working conditions.

[0006] The invention patent with application number 200680041885.3 discloses a resin retainer and rolling bearing. It has an annular reinforcing member installed on the other end face of the annular main part to play a reinforcing role. However, the annular main part and the reinforcing member are prone to delamination due to different forces, which leads to the failure of the retainer. In addition, the two need to be bonded with separate adhesives, which is complicated.

[0007] The invention patent with application number 202210742983.0 discloses a deep groove ball bearing cage, in which an annular boss is provided on the outer circumferential surface of the cage body near the large diameter end as a reinforcing rib of the cage. However, the material of the annular boss is the same as that of the cage body, so its reinforcing effect is limited. Summary of the Invention

[0008] To address the shortcomings of existing technologies, the present invention aims to provide a split bearing cage and its manufacturing method. By differentiating the materials of the second segment forming the axial sidewall of the pocket from those of the first segment, the structural strength of the second segment constituting the axial sidewall of the pocket in the cage is greater than that of the first segment. This improves the structural strength at the bottom wall of the pocket of the cage and reduces the probability of cage damage.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solution: In a first aspect, a split bearing cage includes multiple first segments and multiple second segments, each of which has a concave spherical surface. The first and second segments are arranged alternately and fixedly connected in the circumferential direction. The concave spherical surfaces of two adjacent first segments and the concave spherical surface of a second segment located between them are connected to form the peripheral wall of a cage pocket, and the concave spherical surface of the second segment constitutes the axial sidewall of the pocket. The strength of the material of the second segment is greater than the strength of the material of the first segment.

[0010] As a further implementation, one of the first sub-segment and the second sub-segment has a locking block at both ends in the circumferential direction, and the other has a locking groove formed at both ends in the circumferential direction to engage with the locking block.

[0011] As a further implementation, the card block is arranged at both ends of the second sub-segment in the circumferential direction and at the middle position in the radial direction, and the second sub-segment has an axisymmetric structure; The maximum circumferential length of the second sub-segment is 92-97% of the diameter of the pocket.

[0012] As a further implementation, the end face of the card block is provided with a positioning groove, and a protrusion is formed on the groove wall of the card groove. The protrusion cooperates with the positioning groove to achieve positioning.

[0013] As a further implementation, in the first and second sub-segments before connection, the radial dimension of the slot is smaller than the radial dimension of the block; after the first and second sub-segments are connected, the block and the slot are interference-fitted. Furthermore, the coefficient of thermal expansion of the material forming the slot is greater than that of the material forming the block.

[0014] As a further implementation, a fused adhesive layer is formed at the connection interface between the first sub-segment and the second sub-segment, the fused adhesive layer being formed by the fusion of the end face portions of the first sub-segment and the second sub-segment that are in contact with each other.

[0015] Secondly, a method for manufacturing a split bearing cage, for obtaining a split bearing cage as described above, includes the following steps: The first segment and the second segment were injection molded separately using an injection mold. Before splicing the first sub-segment and the second sub-segment, the first sub-segment is heated to enlarge the slot of the first sub-segment to accommodate the card block. Then the second sub-segment is spliced ​​and fixed with the first sub-segment. After cooling, the slot of the first sub-segment and the card block of the second sub-segment form an interference fit. The cooled cage is placed into a cage mold, and at least one set of segments in the cage is melted by heating. After cooling, a molten adhesive layer is formed at the contact between the first segment and the second segment.

[0016] As a further implementation, after the first and second segments are injection molded, the surface of the second segment is roughened.

[0017] Thirdly, a method for manufacturing a split bearing cage, for obtaining a split bearing cage as described in any of the above, includes the following steps: First, the first segment is injection molded. Then, the first segment is placed into the retainer mold, and the second segment is injection molded to achieve a fixed connection between the first segment and the second segment. Alternatively, the second segment can be injection molded first, and then the second segment can be placed into the retainer mold to continue injection molding the first segment to achieve a fixed connection between the first and second segments.

[0018] As a further implementation method, after the second segment is injection molded, the surface of the second segment needs to be roughened; before the first segment is injection molded, the second segment needs to be preheated.

[0019] The beneficial effects of the present invention are as follows: 1. By setting the bearing cage as a split structure, the material of the part forming the axial sidewall of the pocket (the second sub-segment) is distinguished from that of the other part (the first sub-segment), so that the structural strength of the second sub-segment forming the axial sidewall of the pocket in the cage is greater than that of the first sub-segment, thereby improving the structural strength at the bottom wall of the pocket of the cage and reducing the probability of cage damage.

[0020] 2. After the first segment and the second segment are spliced ​​together, the heating retainer can cause at least one of the first segment and the second segment to melt. After cooling, a molten adhesive layer is formed at the contact point of the first segment and the second segment, which further ensures the connection strength between the segments.

[0021] 3. The first and second sub-segments are precisely connected through the cooperation of the locking blocks and the locking slots. The protrusions and positioning slots play a positioning role during the connection. Before splicing the second sub-segment, the second sub-segment is rough pre-processed, which can further improve the mechanical connection strength between the sub-segments.

[0022] 4. The radial dimension of the card slot is smaller than that of the card block. Before connecting the first segment and the second segment, heating the first segment can increase the radial dimension of the card slot, making it easier for the card slot to fit with the card block. After cooling, the card slot and the card block can achieve an interference fit to ensure the connection strength. Attached Figure Description

[0023] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0024] Figure 1 This is a schematic diagram of the overall structure of the split bearing cage in an embodiment of the present invention; Figure 2 This is a top view of the split bearing cage in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the first sub-segment in an embodiment of the present invention; Figure 4 This is a schematic diagram of the first-view structure of the second sub-segment in an embodiment of the present invention; Figure 5 This is a schematic diagram of the second perspective structure of the second sub-segment in an embodiment of the present invention; Figure 6 This is a partially enlarged schematic diagram of the card slot position in an embodiment of the present invention; Figure 7 This is a partially enlarged schematic diagram of a pocket in an embodiment of the present invention.

[0025] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0026] Among them: 1. First sub-segment, 11. Slot, 12. Slot wall, 13. Protrusion, 2. Second sub-segment, 21. Slot block, 22. Positioning slot, 3. Pocket. Detailed Implementation

[0027] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0028] It should be noted that, unless otherwise specified, the circumferential, axial, and radial directions referred to below are all based on the cage in its working state.

[0029] Example 1 In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a split bearing cage includes multiple first segments 1 and second segments 2. The surfaces of both first segments 1 and second segments 2 are formed with concave spherical surfaces. The first segments 1 and second segments 2 are arranged alternately and fixedly connected in the circumferential direction. The concave spherical surfaces of two adjacent first segments 1 and the concave spherical surface of a second segment 2 located between them are connected to form the peripheral wall of the cage pocket 3, and the concave spherical surface of the second segment 2 constitutes the axial sidewall of the pocket 3. The strength of the material of the second segment 2 is greater than the strength of the material of the first segment 1.

[0030] like Figure 1 and Figure 2 As shown, the number of first sub-segment 1 and second sub-segment 2 is the same. The first sub-segment 1 and second sub-segment 2 are arranged in an alternating manner to form a set of annular bearing cages.

[0031] like Figure 3 As shown, the top of the first segment 1 is provided with two sets of retaining claws, which are arc-shaped and extend in opposite directions. The space between the opposing retaining claws on two adjacent first segments 1 forms a pocket 3. The second segment 2 is spliced ​​between the bottoms of two adjacent first segments 1. Therefore, the bottom of the first segment 1 and the second segment 2 together form the annular base of the cage, and the second segment 2 forms the axial sidewall of the pocket 3, also known as the bottom wall of the pocket.

[0032] A weight-reducing groove is provided between the tops of the two sets of retaining claws in each first segment 1 to achieve the weight reduction of the cage and facilitate the subsequent placement of the balls.

[0033] Considering that the stress concentration effect on the bottom wall of the injection-molded cage pocket will be further amplified when the bearing is running at high speed, in order to solve this problem, the cage in this embodiment is a split structure, which separates the part that constitutes the axial sidewall of the pocket 3 from other parts. The cage is divided into two parts: the first sub-segment 1 and the second sub-segment 2. In order to improve the structural strength of the axial sidewall of the pocket 3, the first sub-segment 1 and the second sub-segment 2 in this embodiment are made of different materials, and the structural strength of the second sub-segment 2 is greater than that of the first sub-segment 1, so as to fully ensure the structural strength of the bottom wall of the pocket when the bearing is running at high speed and reduce the probability of cage damage.

[0034] Moreover, in this embodiment, the first segment 1 and the second segment 2 are both made of polymer materials and do not include metal materials, which can ensure the lightweight of the cage.

[0035] The first sub-segment 1 and the second sub-segment 2 are fixedly connected by splicing. In order to ensure the strength of the connection between the two, the first sub-segment 1 and the second sub-segment 2 are fixedly connected by snapping together by the snapping of the snapping block 21 and the snapping slot 11.

[0036] One of the first sub-segment 1 and the second sub-segment 2 has a locking block 21 at both ends of its circumference, and the other has a locking groove 11 formed at both ends of its circumference to engage with the locking block 21.

[0037] In an optional example, slot 11 is arranged on the second sub-segment 2, while block 21 is arranged on the first sub-segment 1.

[0038] like Figures 3-6 As shown, in this embodiment, the second sub-segment 2 has a locking block 21 at both circumferential ends. The locking block 21 is a block structure, and the bottom circumferential ends of the first sub-segment 1 form a locking groove 11 corresponding to the locking block 21. The locking groove 11 is used to accommodate the locking block 21.

[0039] During assembly, the locking blocks 21 at both ends of the second sub-segment 2 are respectively inserted into the locking slots 11 of the two adjacent first sub-segments 1, which are close to each other, to achieve a fixed connection between the first sub-segment 1 and the second sub-segment 2 into a single structure. Figure 1 As shown. The top surface of the second sub-segment 2 is a concave spherical surface, which coincides with the center of the concave spherical surface of the peripheral wall of the pocket 3.

[0040] like Figure 4 As shown, the card block 21 is specifically arranged at both ends of the second sub-segment 2 in the circumferential direction and is located in the middle position in the radial direction. The second sub-segment 2 is an axisymmetric structure to ensure the stability of the structure under stress.

[0041] like Figure 5 As shown, since the strength of the material of the second segment 2 is greater than that of the material of the first segment 1, a weight-reducing groove can be formed on the side of the second segment 2 away from the pocket 3 to achieve the purpose of weight reduction, which is conducive to the lightweighting of the cage.

[0042] Optionally, the axial depth and radial length of the weight-reducing groove in the second segment 2 can be consistent with the dimensions of the weight-reducing groove provided on the bottom surface of the first segment 1 away from the retaining claw, so as to facilitate the manufacture of the first segment 1 and the second segment 2.

[0043] like Figure 7As shown, in order to fully guarantee the structural strength of the bottom wall of the pocket 3, the maximum circumferential length of the second segment 2 is 92-97% of the diameter of the pocket 3, preferably 95%. It can be understood that the maximum length of the second segment 2 is the maximum distance between the end faces of the two locking blocks 21.

[0044] In this embodiment, in order to reduce the manufacturing difficulty of the first sub-segment 1 and the second sub-segment 2, the card block 21 and the card slot 11 are approximately cuboid structures.

[0045] like Figure 6 As shown, the groove wall 12 of the slot 11 needs to mate with the end face of the card block 21, so the groove wall 12 is parallel to the end face of the card block 21.

[0046] In other embodiments, the card block 21 and the card slot 11 can also be in the shape of a cone, a triangular prism, or an irregular shape, as long as they can be connected and their sizes are compatible.

[0047] To ensure accurate docking of the first sub-segment 1 and the second sub-segment 2, such as Figure 5 and Figure 6 As shown, a positioning groove 22 is provided on the end face of the card block 21, and a protrusion 13 is correspondingly formed on the groove wall 12 (i.e. the bottom surface of the groove) of the card groove 11. The first sub-segment 1 and the second sub-segment 2 cooperate with the positioning groove 22 through the protrusion 13 to achieve precise positioning during splicing, thereby ensuring the smooth transition between the concave spherical surface of the second sub-segment 2 and the concave spherical surface of the first sub-segment 1, and thus ensuring the rotation of the rolling element.

[0048] The number of protrusions 13 on each groove wall 12 and the number of positioning grooves 22 on the end face of each card block 21 are both set to two. In other examples, the number can be adjusted as needed. The protrusions 13 are hemispherical structures, and the positioning grooves 22 are adapted to the shape of the protrusions 13, and are hemispherical groove structures.

[0049] In a preferred example, in order to improve the bonding strength of the first segment 1 and the second segment 2, the radial dimension of the slot 11 is smaller than the radial dimension of the block 21 before splicing. Therefore, when connecting the corresponding segments, the first segment 1 needs to be heated first, so that the radial dimension of the slot 11 on the first segment 1 becomes larger enough to accommodate the block 21. After cooling, the slot 11 and the block 21 form an interference fit, which fully ensures the bonding strength of the first segment 1 and the second segment 2.

[0050] To further improve the bonding strength, after achieving the interference fit, the cage can be placed in the cage mold and heated again, so that the contact end faces of the first segment 1 and the second segment 2 soften, melt, and penetrate each other, and then cool. At this time, a molten adhesive layer is formed at the contact point of the two segments (the first segment 1 and the second segment 2).

[0051] Therefore, in this embodiment, the melting point ranges of the two segment materials overlap to allow the materials of the two segments to penetrate each other at the contact end face after heating, thereby forming a molten adhesive layer including the two materials, which helps to improve the connection strength of the two segments.

[0052] Since the structural strength of the second segment 2 is greater than that of the first segment 1, the first segment 1 and the second segment 2 are made of different materials. The first segment 1 and the second segment 2 can be injection molded separately using a mold. After injection molding, the surface of the second segment 2 can be roughened to improve the bonding strength between the two.

[0053] The material of the first segment 1 is polyamide. Optionally, the material of the first segment 1 can be polyamide 46 (melting point: 290℃ to 295℃) or polyamide 66 (melting point: 250℃ to 267℃).

[0054] The material of the second segment 2 is PEEK (Polyetheretherketone, melting point: 343°C), or PEKK (Polyetherketoneketone, melting point: 367°C), or PEK (Polyetherketone, melting point: 373°C), or PPS (Polyphenylene Sulfide, melting point: 285-300°C).

[0055] Alternatively, polyamide 46 grade: TE250F6; polyamide 66 grade: A3HG5.

[0056] Optionally, the PEEK grade is 90CA30; the PEKK grade is Kepstan® 8002; the PEK grade is Victrex PEK220; and the PPS grade is Fortron® 1130T4.

[0057] Preferably, the first segment 1 is made of polyamide 46, and the second segment 2 is made of PEEK (90CA30). The coefficient of thermal expansion of the first segment 1 is greater than that of the second segment 2, wherein the coefficient of thermal expansion of polyamide 46 is 80 × 10⁻⁶. -6 At / ℃, the coefficient of thermal expansion of PEEK is 30×10⁻⁶. -6 / ℃.

[0058] By setting the bearing cage as a split structure, the part forming the axial sidewall of the pocket 3 (second sub-segment 2) is separated and its material is distinguished from other parts (first sub-segment 1). This makes the structural strength of the second sub-segment 2, which forms the axial sidewall of the pocket 3, greater than that of the first sub-segment 1. This improves the structural strength at the bottom wall of the pocket 3 of the cage and reduces the probability of cage damage.

[0059] Example 2 A method for manufacturing a split bearing cage, the method for obtaining the split bearing cage of Embodiment 1, includes the following steps: First, the first segment 1 and the second segment 2 need to be injection molded separately using an injection mold; the number of the first segment 1 and the second segment 2 is the same, and in this embodiment, there are nine of each.

[0060] The material of the first segment 1 is polyamide 46, and the material of the second segment 2 is PEEK.

[0061] Since the coefficient of thermal expansion of the first segment 1 is significantly greater than that of the second segment 2, and the radial dimension of the slot 11 in the first segment 1 is smaller than that of the block 21 in the second segment 2, the first segment 1 can be heated (at a temperature of 120-150℃, below the melting point of polyamide 46) before splicing the first segment 1 and the second segment 2. This increases the radial dimension of the slot 11 in the first segment 1 to accommodate the block 21. Then, the first segment 1 and the second segment 2 are joined together, so that the slot 11 engages with the block 21, and the protrusion 13 and the positioning groove 22 are precisely aligned to form a retainer.

[0062] After all the first sub-segment 1 and second sub-segment 2 are connected, they are cooled so that the card block 21 and the card slot 11 form an interference fit, thereby ensuring the connection strength of the first sub-segment 1 and the second sub-segment 2.

[0063] To further ensure the connection strength between the segments, after the segments are spliced, the retainer is heated so that at least one of the first segment 1 and the second segment 2 melts, thereby forming a molten adhesive layer at the contact point of the two segments.

[0064] To avoid the influence of heating on the shape of the cage, the cage is placed in the cage mold before heating. For example, the first segment 1 is made of polyamide 46 and the second segment 2 is made of PEEK. This allows the heating temperature of the cage to be maintained between 290°C and 295°C, causing the first segment 1 to soften and melt while the second segment 2 does not soften or melt. After cooling, a molten adhesive layer is formed at the contact between the first segment 1 and the second segment 2.

[0065] In this embodiment, after the first segment 1 and the second segment 2 are injection molded, the circumferential end face of the second segment 2 is roughened, such as by sandblasting and silane coupling agent treatment, to increase the surface roughness of the second segment 2. Specifically, roughening pretreatment can be performed on the end face of the second segment 2 and on each side of the card block 21 to improve the mechanical bonding force with the first segment 1.

[0066] It should be noted that when injection molding the first segment 1, the injection temperature of polyamide 46 should not exceed 300℃, and the mold temperature should be 80-90℃ to reduce the thermal stress of the insert.

[0067] Example 3 A method for manufacturing a split bearing cage, the method for obtaining the split bearing cage of Embodiment 1, includes the following steps: First, injection mold the first segment 1, then place the first segment 1 into the retainer mold, and continue injection mold the second segment 2 to achieve a fixed connection between the first segment 1 and the second segment 2.

[0068] Alternatively, the second segment 2 can be injection molded first, and then the second segment 2 can be placed into the retainer mold, and the first segment 1 can be injection molded to achieve a fixed connection between the first segment 1 and the second segment 2.

[0069] Unlike Embodiment 2, in this embodiment, one of the first segment 1 and the second segment 2 is injection molded first. Preferably, in this embodiment, the second segment 2 is injection molded first. The difference between this and the first segment 1 being injection molded first is that after the second segment 2 is injection molded first, it can be roughened, while if the first segment 1 is injection molded first, the second segment 2 cannot be roughened.

[0070] Taking the injection molding of the second segment 2 as an example, specifically, all the second segments 2 are injection molded first, then all the second segments 2 are arranged in the cage injection mold, and then the first segment 1 is injection molded, so that the two are tightly connected.

[0071] This embodiment uses an insert injection molding process. Specifically, the second segment 2 is first formed by PEEK injection molding. Each second segment 2 is placed in the cage injection mold. Then, polyamide 46 is melted and injected into the mold. After cooling, a complete cage is formed.

[0072] After the second segment 2 is formed by injection molding, the circumferential end face of the second segment 2 needs to be roughened (such as by grinding or plasma treatment) to increase its surface roughness and improve its mechanical bonding force with the first segment 1.

[0073] In this embodiment, the injection temperature is controlled at 290-310℃, the cage injection mold temperature is 80-100℃, and a short injection time and moderate holding pressure are used to reduce the contact time between the high-temperature first segment 1 melt and the PEEK insert, thereby reducing the impact of heat conduction.

[0074] During injection molding, ensure that the first segment 1 flows fully and adheres to the insert in the second segment 2. Before injection molding, preheat the insert in the second segment 2 (temperature 80-100℃) to reduce the temperature difference between the insert and the melt of the first segment 1, and avoid bonding defects caused by rapid cooling of the melt after contact with the insert.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A split-type bearing cage, characterized in that, It includes multiple first segments and multiple second segments, each of which has a concave spherical surface. The first and second segments are arranged alternately and fixedly connected along the circumferential direction. The concave spherical surfaces of two adjacent first segments and the concave spherical surface of a second segment located between them are connected to form the peripheral wall of the retainer pocket, and the concave spherical surface of the second segment constitutes the axial sidewall of the pocket. The strength of the material of the second segment is greater than that of the material of the first segment. One of the first sub-segment and the second sub-segment has locking blocks at both ends of its circumference, and the other has locking grooves at both ends of its circumference that engage with the locking blocks. In the first and second sub-segments before connection, the radial dimension of the slot is smaller than the radial dimension of the block; after the first and second sub-segments are connected, the block and the slot are interference-fitted. Furthermore, the coefficient of thermal expansion of the material forming the slot is greater than that of the material forming the block.

2. The split bearing cage according to claim 1, characterized in that, The card blocks are arranged at both ends of the second sub-segment in the circumferential direction and at the middle position in the radial direction. The second sub-segment has an axisymmetric structure. The maximum circumferential length of the second sub-segment is 92-97% of the diameter of the pocket.

3. The split bearing cage according to claim 1, characterized in that, The end face of the card block is provided with a positioning groove, and the groove wall is formed with protrusions, which cooperate with the positioning groove to achieve positioning.

4. The split bearing cage according to claim 1, characterized in that, A molten adhesive layer is formed at the interface between the first sub-segment and the second sub-segment. The molten adhesive layer is formed by the fusion of the end face portions of the first sub-segment and the second sub-segment that are in contact with each other.

5. A method for manufacturing a split-type bearing cage, characterized in that, To obtain the split bearing cage as described in any one of claims 1-4, the following steps are included: The first segment and the second segment were injection molded separately using an injection mold. Before splicing the first sub-segment and the second sub-segment, the first sub-segment is heated to enlarge the slot of the first sub-segment to accommodate the card block. Then the second sub-segment is spliced ​​and fixed with the first sub-segment. After cooling, the slot of the first sub-segment and the card block of the second sub-segment form an interference fit. The cooled cage is placed into a cage mold, and at least one set of segments in the cage is melted by heating. After cooling, a molten adhesive layer is formed at the contact between the first segment and the second segment.

6. The method for manufacturing a split bearing cage according to claim 5, characterized in that, After the first and second segments are injection molded, the surface of the second segment is roughened.

7. A method for manufacturing a split-type bearing cage, characterized in that, To obtain the split bearing cage as described in any one of claims 1-4, the following steps are included: First, the first segment is injection molded. Then, the first segment is placed into the retainer mold, and the second segment is injection molded to achieve a fixed connection between the first segment and the second segment. Alternatively, the second segment can be injection molded first, and then the second segment can be placed into the retainer mold to continue injection molding the first segment to achieve a fixed connection between the first and second segments.

8. The method for manufacturing a split bearing cage according to claim 7, characterized in that, After the second segment is injection molded, the surface of the second segment needs to be roughened; before the first segment is injection molded, the second segment needs to be preheated.

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