A fixed node retainer and method of manufacturing the same

Abstract

This invention discloses a fixed-section retainer and its manufacturing method. The fixed-section retainer specifically includes a rigid frame and a flexible coating layer. Recessed areas are formed on the inner and outer walls of the frame, covering at least the areas on the inner and outer walls that contact the outer spherical surface of the inner star wheel and the inner spherical surface of the outer star wheel. A first coating layer is cured within the recessed areas. The frame has a plurality of limiting windows evenly distributed along its circumference. A second coating layer is cured on each limiting window on both side walls of the frame in the circumferential direction. This invention reduces the coefficient of friction by curing a first coating layer on the inner and outer surfaces in the area where they mate with the spherical surfaces, thereby reducing spherical friction and torque transmission loss. Simultaneously, the second coating layer on the two opposing limiting structures of the limiting windows reduces vibration and noise caused by the steel ball directly striking the side beams within the limiting windows, improving the user's driving experience.

Description

Technical Field

[0001] This invention relates to the field of vehicle component technology, and in particular to a fixed section retainer and its manufacturing method. Background Technology

[0002] The cage is a component used to partially enclose all or part of the rolling elements and move with them. It is an important part of the constant velocity drive shaft fixed joint in vehicles. After assembly, the cage can constrain the movement trajectory of the steel balls in the fixed joint, allowing the fixed joint to run smoothly. However, during the actual operation of the fixed joint, the cage will bear a large axial force. The axial force will concentrate the axial clearance of the components in the fixed joint on the wheel side, causing the inner and outer spherical areas of the cage to contact and rub against the outer spherical surface of the inner star wheel and the inner spherical surface of the outer star wheel, respectively. This will result in some torque power loss. At the same time, under the condition of large turning angle, the steel balls are always rolling within the cage window. In the circumferential direction of the cage, the edge beam of the window will collide with and limit the movement of the steel balls, generating noise. Although the internal structure of the fixed joint and the grease will absorb and weaken the sharp abnormal noise, a muffled sound similar to a gurgling sound can still be heard inside and outside the vehicle, which will affect the customer's driving experience and willingness to purchase the vehicle.

[0003] Therefore, how to optimize the cage structure to reduce torque loss and operating noise is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] This invention proposes a fixed section cage and its manufacturing method to reduce torque loss and operating noise during cage operation.

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

[0006] In a first aspect, the present invention provides a fixed joint retainer, comprising a rigid frame and a flexible coating layer. The inner and outer walls of the frame are respectively provided with recessed areas, the recessed areas at least covering the areas on the inner and outer walls that contact the outer spherical surface of the inner star wheel and the inner spherical surface of the outer star wheel. The coating layer includes a first coating layer and a second coating layer, the first coating layer being cured and disposed in the recessed areas. The frame is uniformly provided with a plurality of limiting windows along its circumference, and the second coating layer is cured and disposed on the two side walls of each limiting window in the circumferential direction of the frame.

[0007] Optionally, in the above-mentioned fixed section retainer, the skeleton includes a reference portion at both ends in the axial direction. The reference portion is an exposed annular structure, and each reference portion includes the axial end face region of the skeleton.

[0008] Optionally, in the aforementioned fixed section retainer, the first coating layer completely fills the area between the reference portions at both ends in the axial direction of the skeleton.

[0009] Optionally, in the aforementioned fixed section retainer, the connection structure between the skeleton and the first coating layer is composed of a first arc segment, a second arc segment, and a third arc segment arranged sequentially along its axial direction. The first arc segment and the third arc segment have the same diameter and arc length and are symmetrically arranged about the second arc segment, and the diameter of the first arc segment is greater than the diameter of the second arc segment.

[0010] Optionally, in the above-mentioned fixed section retainer, the diameter of the first arc segment is increased by 0.015mm-0.02mm compared with the diameter of the second arc segment.

[0011] Optionally, in the aforementioned fixed section retainer, the second coating layer includes a contact layer and a buffer layer. The buffer layer has a granular structure and is vulcanized and fixed to the skeleton, while the contact layer is cured and disposed on the buffer layer.

[0012] Secondly, the present invention provides a manufacturing method for manufacturing the fixed section retainer provided in any of the above embodiments, comprising at least the following steps:

[0013] Shot blasting: The skeleton after carburizing heat treatment is shot blasted using a crawler shot blasting machine. The shot blasting time is 4-6 minutes and the steel shot diameter is 1 mm to remove the oxide scale and some residual stress on the surface of the skeleton after carburizing.

[0014] Cleaning: After shot blasting, the skeleton undergoes degreasing, cleaning, pickling, neutralization cleaning, phosphating and cleaning processes to form a rough oxide film on the skeleton surface.

[0015] Coating: Place the phosphated skeleton on the coating fixture, preheat to 100℃-160℃, and then bond the coating medium to the skeleton of the cage by extrusion injection molding or spraying. The extrusion or spraying temperature is 360℃-380℃, and the temperature is rapidly reduced after coating.

[0016] Grinding: The inner and outer spherical surfaces of the cage are ground using a grinding machine. After dressing the grinding wheel with a diamond roller, the inner and outer spherical surfaces of the cage are further ground. The inner and outer spherical surfaces of the cage are ground into a three-segment arc structure with the diameter of the two end regions being larger than the diameter of the middle region in the axial direction.

[0017] Optionally, in the above manufacturing method, in the cleaning step, the degreasing cleaning process uses an ultrasonic cleaner to perform ultrasonic cleaning on the skeleton using a degreasing cleaning solution at 45℃-55℃ as the medium.

[0018] The pickling process uses 8%-12% hydrochloric acid and pickles for 1 minute at a temperature not exceeding 30°C;

[0019] The phosphating process uses zinc-based or manganese-based phosphating solutions with a concentration of 5%-7% and a pH of 2.0-3.0. The phosphating is carried out at a temperature of not less than 10°C for 10-15 minutes.

[0020] Optionally, in the above manufacturing method, three independent water tanks—a neutralization tank, an immersion tank, and a rinsing tank—are used in the neutralization cleaning process and the cleaning process after phosphating. The neutralization tank is filled with a 3% sodium hydroxide solution for acid-base neutralization, and the rinsing tank is filled with flowing water at a flow rate of 4L / min-6L / min for impurity cleaning.

[0021] Optionally, in the above manufacturing method, the hardness of the skeleton body is HRC60-HRC64, and the surface hardness of the coated area on the skeleton is HRC58-HRC62.

[0022] As can be seen from the above technical solution, the fixed section retainer provided by the present invention combines a rigid frame with a flexible coating layer. Specifically, based on the frame structure, and considering the fixed section's operation at large angles, recessed areas are provided on the frame in regions where the frame may come into contact with the spherical surfaces of the inner and outer star wheels in the fixed section. A first coating layer is then filled and cured in these recessed areas. This first coating layer ensures that the inner and outer walls of the frame maintain their complete spherical structure, thus maintaining contact with the inner and outer star wheels even at large angles. Simultaneously, the first coating layer replaces the rigid frame structure, contacting and sliding against the inner and outer star wheels. The flexible structure reduces the coefficient of friction between the steel ball and the inner and outer star wheels, thereby reducing torque transmission loss and improving transmission efficiency. Simultaneously, the limiting window on the frame has a second coating layer fixedly installed on its two side walls in the circumferential direction. The steel ball rolls within the limiting window during normal operation of the fixed section and collides with the side walls of the limiting window (where the second coating layer is located) during large turns of the fixed section. Compared to the rigid collision structure in existing technologies, this design not only produces less vibration and noise, but also absorbs some noise through the second and first coating layers, resulting in superior NVH performance for the entire vehicle and a better user experience. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort, and the present invention can be applied to other similar scenarios based on the provided drawings. Unless obvious from the linguistic context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0024] Figure 1 This is a schematic diagram of the fixed section retainer structure provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the front cross-sectional structure of the cage in one embodiment of the present invention;

[0026] Figure 3 for Figure 2 A top-view cross-sectional view of the middle cage.

[0027] Figure 4 yes Figure 3 Detailed map of area A in the document;

[0028] Figure 5 This is a schematic diagram of the front cross-sectional structure of the cage in another embodiment of the present invention;

[0029] Figure 6 for Figure 5 A top-view cross-sectional view of the middle cage.

[0030] Figure 7 yes Figure 6 Detailed drawing of area B in the diagram;

[0031] Figure 8 This is a side view of the cage;

[0032] Figure 9 yes Figure 8 A schematic diagram of the cross-sectional structure.

[0033] Wherein, 10-frame; 110-limiting window; 120-reference part; 210-first coating layer; 220-second coating layer; 310-first arc segment; 320-second arc segment; 330-third arc segment; 40-steel ball. Detailed Implementation

[0034] The cage is an important component assembled in the constant velocity drive shaft retainer. Currently, in order to meet the strength requirements of the cage, the material is generally low carbon alloy steel, which is manufactured through processes such as turning, punching, heat treatment, grinding and finishing. However, the spherical structure on its inner and outer walls will have sliding friction with the gear train, and torque loss will occur due to the large friction coefficient of rigid contact. At the same time, the rigid fit between the steel ball and the cage will also generate a lot of collision noise under large turning angle conditions, which will affect the user's driving experience.

[0035] To enable those skilled in the art to better understand the present invention, embodiments of the present invention will be described below with reference to the accompanying drawings. Furthermore, the embodiments shown below do not limit the scope of the invention as described in the claims. Additionally, the complete contents of the configurations shown in the embodiments below are not limited to those necessary for the solution of the invention described in the claims.

[0036] See Figure 1 and Figure 2 The fixed section retainer provided in this embodiment of the invention mainly consists of a frame 10 and a coating layer. The frame 10 is a rigid material structure, similar to existing technologies, providing a basic load-bearing structure for the retainer. The coating layer is a flexible material and is cured onto the wall surface of the frame 10. The coating layer includes at least a first coating layer 210 and a second coating layer 220. Specifically, the frame 10 has recessed areas on its inner and outer wall surfaces, and these recessed areas at least cover the spherical areas on both the inner and outer wall surfaces of the frame 10. It should be noted that the spherical areas on the inner and outer wall surfaces of the frame 10 are areas where the frame 10 may contact the outer spherical surface of the inner star wheel and the inner spherical surface of the outer star wheel during operation of the fixed section. The spherical areas are determined according to the size of the fixed section in actual application. The recessed areas cover the inner and outer wall surfaces. While the surface of the frame 10 contacts the outer spherical surface of the inner star wheel and the inner spherical surface of the outer star wheel, a first coating layer 210 is solidified in the recessed area. The first coating layer 210 fills the area where the recessed area is located on the frame 10. It not only tightly bonds with the frame 10, but also makes the inner and outer wall surfaces of the frame 10 complete structural surfaces without defects, so as to ensure a good connection between the cage and the outer star wheel of the inner star wheel. That is, in the operation condition of the fixed section with a large rotation angle, the first coating layer 210 replaces the original frame 10 structure to contact and slide friction with the inner and outer star wheels. It should be noted that, with the same spherical mating clearance, the first coating layer 210 has a smaller coefficient of friction with the inner and outer star wheels compared to the rigid frame 10 structure, which can reduce the friction of the spherical pair and reduce torque transmission loss.

[0037] Meanwhile, similar to commonly used cage structures, the fixed section cage provided in this embodiment of the invention has a plurality of limiting windows 110 evenly distributed along its circumference on the frame 10 for setting and limiting the movement of the steel ball 40. It should be noted that in the axial direction of the frame 10, the two walls of a single limiting window 110 are interference-fitted with the steel ball 40, and they are always in contact. Therefore, the two walls are exposed metal structures to maintain the connection with the steel ball 40. In the circumferential direction of the frame 10, a second coating layer 220 is solidified on the two side walls of a single limiting window 110. When the fixed section is in a large-angle operating condition, the limiting... The walls on both sides of window 110 bear the impact of steel ball 40, and the impact of steel ball 40 is partially absorbed by the flexible second coating layer 220 to reduce the noise caused by steel ball 40 hitting the side wall of limiting window 110. At the same time, compared with the rigid frame 10 structure, the second coating layer 220 and the first coating layer 210 have weaker noise transmission performance, which can reduce the transmission of impact noise of steel ball 40, thereby achieving the effect of improving the NVH performance of the whole vehicle. It should be noted that the frame 10 is a regular rotating body structure. In this article, the axis of frame 10 is the direction parallel to the center line of frame 10 structure, and the circumferential direction of frame 10 is the rotation direction of rotating body structure.

[0038] It should be further explained that the second coating layer 220 on the skeleton 10 can be provided to cover the original structure. Similarly, a recessed structure can be provided at the location where the second coating layer 220 is provided, so that the second coating layer 220 fills the corresponding area and improves the stability of its connection.

[0039] The fixed section retainer provided in this embodiment of the invention combines a rigid frame 10 with a flexible coating layer. Specifically, based on the frame 10 structure, and considering the fixed section's operation at large angles, recessed areas are provided on the frame 10 in regions that may contact the spherical surfaces of the inner and outer star wheels in the fixed section. A first coating layer 210 is then filled and cured in these recessed areas. The filling of the first coating layer 210 ensures that the inner and outer walls of the frame 10 maintain their complete spherical structure, thus maintaining contact with the inner and outer star wheels even at large angles. Simultaneously, the first coating layer 210 replaces the rigid frame 10 structure, contacting and sliding against the inner and outer star wheels. The flexible structure of the first coating layer 210 allows for… The friction coefficient between the steel ball and the inner and outer star wheels is reduced, thereby reducing torque transmission loss and improving transmission efficiency. At the same time, the limiting window 110 on the frame 10 is also equipped with a second coating layer 220 on the two side walls in the circumferential direction of the frame 10. The steel ball 40 rolls inside the limiting window 110 under normal operating conditions of the fixed section, and collides with the side wall of the limiting window 110, i.e. the position where the second coating layer 220 is provided, when the fixed section is at a large turning angle. Compared with the rigid collision structure in the prior art, it not only has less vibration and less noise, but also absorbs some noise through the second coating layer 220 and the first coating layer 210, making the NVH performance of the whole vehicle better and giving customers a better driving experience.

[0040] Furthermore, considering the need for uniform design, manufacturing process, and inspection reference surfaces in the actual production of the fixed section cage to ensure its structural accuracy, see [reference needed]. Figure 2 and Figure 8 Therefore, in some embodiments of the present invention, the skeleton 10 includes a reference portion 120 at both ends in the axial direction. Each reference portion 120 is an exposed annular metal structure without a coating layer, and each reference portion 120 includes an end face region of the skeleton 10 in the axial direction, so that the two end faces of the skeleton 10 in the axial direction can serve as reference surfaces, so that the cage can be calibrated and tested. That is, when viewed from the axial direction of the skeleton 10, both sides are exposed metal structures, and the first coating layer 210 is provided in the area between the two reference portions 120, on the inner wall surface and the outer wall surface of the skeleton 10.

[0041] Based on the above embodiments, the first coating layer 210 is suitable for filling the recessed areas on the skeleton 10, and for contacting and rubbing against the inner and outer star wheels under the large rotation angle conditions of the fixed section. Therefore, see Figure 5-7 The first coating layer 210 can be applied only to the two spherical regions on the axial sides of the skeleton 10, while it is not required in the middle region, in order to maintain the rigidity of the skeleton 10 and reduce the structural damage caused by the recessed areas; and see Figure 2-4In other embodiments of the present invention, based on verifying that the strength of the frame 10 meets the operating requirements of the fixed section, in order to improve the ease of opening the recessed area on the frame 10 and the ease of curing the first coating layer 210, the first coating layer 210 completely fills the area between the two reference portions 120 in the axial direction of the frame 10. That is, in the axial direction of the frame 10, its inner wall surface or outer wall surface is a structure in which the first coating layer 210 is sandwiched between the two reference portions 120. The recessed area on one side wall of the frame 10 and the first coating layer 210 are integral structures without the need for segmentation, which reduces the processing and production difficulty of the frame 10. At the same time, the larger area of ​​the first coating layer 210 makes the cage have greater noise absorption performance during the collision of the steel ball 40, which can improve the NVH performance of the vehicle to a certain extent.

[0042] To improve the fit between the cage and the outer and inner star wheels during the operation of the fixed section, see [reference needed]. Figure 8 and Figure 9 In some embodiments of the present invention, the integral structure after the skeleton 10 and the first coating layer 210 are combined is a segmented structure in its axial direction, specifically including a first arc segment 310, a second arc segment 320, and a third arc segment 330 arranged sequentially along the axial direction. The first arc segment 310 and the third arc segment 330 have the same diameter and arc length, and are symmetrically arranged about the second arc segment 320. Furthermore, the diameters of the first arc segment 310 and the third arc segment 330 are both larger than the diameter of the second arc segment 320. When the inner wall surface of the skeleton 10 is spherically fitted with the inner star wheel, and the outer wall surface is spherically fitted with the outer star wheel, the first arc segment... The structure of arc segment 310 and the third arc segment 330 protruding towards the center line of the frame 10 compared to the second arc segment 320 allows the inner and outer star wheels to tend to move towards the bisecting plane of the second arc segment 320 after contacting the spherical surface of the cage, thus achieving self-centering of the outer and inner star wheels. It should also be noted that since the spherical area of ​​the cage in contact with the inner and outer star wheels is coated with the first coating layer 210, the flexible first coating layer 210 has a certain toughness and can compensate for the tolerance fluctuations generated during the grinding process of the frame 10, thereby reducing the gap between the spherical structure of the inner and outer walls of the cage and the spherical fit of the outer and inner star wheels, and improving the problem of the whole vehicle making a figure-eight noise caused by axial movement.

[0043] Furthermore, in some embodiments of the present invention, the diameters of the first arc segment 310 and the third arc segment 330 are increased by 0.015mm-0.02mm compared to the second arc segment 320, so that the cage has a self-centering effect on the inner and outer star wheels while having a smoother and more integrated appearance structure, avoiding the risk of stress concentration due to obvious protrusions.

[0044] In the fixed section retainer provided in this embodiment of the invention, the coating layer is a nylon coating, which contains low-friction, high-load-bearing materials such as polytetrafluoroethylene. The nylon coating layer can be cured onto the metal frame 10 by extrusion injection molding, powder spraying, light curing and other technical means. The fully cured retainer structure is then machined by grinding to achieve the required dimensions. In a specific embodiment of the invention, the second coating layer 220 specifically includes a contact layer and a buffer layer. The buffer layer preferably has a structure of multiple particles to be fixed onto the frame 10 by fluidization. The particle structure enables the buffer layer to have a better buffering and vibration reduction effect. The contact layer is cured on the buffer layer and is used to directly contact the steel ball 40. It can be made of a more wear-resistant material. The second coating layer 220 can be layered with different materials so that the second coating layer 220 has good buffering performance, while the contact layer improves its wear resistance and service life.

[0045] Some embodiments of the present invention also provide a manufacturing method for smoothly preparing the fixed section retainer provided in any of the above embodiments. The manufacturing method will be described in detail below. It should be noted that the following steps are subsequent processes based on the skeleton 10 with recessed areas. Since the production and manufacturing of the rigid skeleton 10 is similar to existing technologies, and creating recessed areas in the skeleton 10 structure is a common technical means, the corresponding steps will not be detailed here. The manufacturing method provided by the present invention includes at least the following steps:

[0046] S01: Shot blasting: The skeleton after carburizing heat treatment is shot blasted using a crawler shot blasting machine. The shot blasting time is 4-6 minutes and the steel shot diameter is 1 mm to remove the oxide scale and some residual stress on the surface of the skeleton after carburizing.

[0047] It should be noted that the purpose of carburizing heat treatment is to form a layer of high carbon compound on the surface of the skeleton 10 to improve the hardness and wear resistance of the skeleton 10. The carburized skeleton 10 needs to undergo quenching and low-temperature tempering processes. Therefore, the shot blasting step can remove some of the residual stress caused by quenching while removing the oxide scale.

[0048] S02: Cleaning: After shot blasting, the skeleton undergoes degreasing, cleaning, pickling, neutralization cleaning, phosphating and cleaning processes to form a rough oxide film on the skeleton surface.

[0049] It should be noted that degreasing cleaning removes grease and dirt adhering to the surface of the metal substrate by using a degreasing agent. Specifically, in some embodiments of the present invention, the degreasing cleaning process uses an ultrasonic cleaner, and the prepared degreasing cleaning solution is used as a medium. The degreasing cleaning solution is heated to 45°C-55°C and then ultrasonic cleaning is performed.

[0050] It should also be noted that, based on the above embodiments, the pickling process is used to remove oxide scale, rust and other contaminants from the metal surface to clean and prepare the metal surface. Specifically, the pickling process uses hydrochloric acid with a concentration of 8%-12% and pickles for 1 minute at a temperature not exceeding 30°C. In this embodiment, the concentration of hydrochloric acid, the pickling temperature and the pickling time must be strictly controlled to avoid hydrogen ions penetrating into the material gaps, which could lead to hydrogen embrittlement of the skeleton 10.

[0051] Furthermore, the phosphating process is used to form a phosphating film on the surface of the skeleton 10, thereby protecting the skeleton 10 and preventing it from being corroded to a certain extent. The phosphating process uses a zinc-based or manganese-based phosphating solution with a concentration of 5%-7% and a pH of 2.0-3.0. Meanwhile, the skeleton 10 is phosphated for 10-15 minutes in a treatment environment of not less than 10°C.

[0052] S03: Coating: Place the phosphated skeleton on the coating fixture, preheat to 100℃-160℃, and then combine the coating medium with the skeleton of the cage by extrusion injection molding or spraying. The extrusion or spraying temperature is 360℃-380℃, and the temperature is rapidly reduced after coating.

[0053] It should be noted that when the coating layer is preferably made of nylon material, it is suitable for commonly used equipment and temperature requirements. The cage after coating needs to be cooled down quickly to avoid the risk that the hardening hardness or hardened layer depth of the cage skeleton 10 will undergo metallographic transformation due to high temperature, which may lead to a reduction in the hardened layer depth and surface hardness and affect the product performance.

[0054] S04: Grinding: The inner and outer spherical surfaces of the cage are ground using a grinding machine. After dressing the grinding wheel with a diamond roller, the inner and outer spherical surfaces of the cage are further ground. The inner and outer spherical surfaces of the cage are ground into a three-segment arc structure with the diameter of the two end regions being larger than the diameter of the middle region in the axial direction.

[0055] It should be noted that in step S04, grinding the inner and outer spherical surfaces of the cage into a three-segment arc structure with the diameter of the two end regions being larger than the diameter of the middle region in the axial direction can satisfy the self-centering function of the inner and outer star wheels when they are fitted with the spherical surfaces of the cage.

[0056] Furthermore, in the manufacturing method provided in this embodiment of the invention, in step S02, three independent water tanks are used in the neutralization cleaning process and the cleaning process after phosphating to ensure the cleaning effect. Specifically, a neutralization tank, an soaking tank, and a rinsing tank are used. The neutralization tank is filled with a 3% sodium hydroxide solution for acid-base neutralization cleaning, while the rinsing tank is filled with industrial flowing water at a flow rate of 4L / min-6L / min for impurity cleaning.

[0057] It should also be noted that in step S03, the quenching hardness and hardening layer depth of the cage frame 10 can be adjusted according to the actual process requirements. Specifically, the hardness of the body of the frame 10 is HRC60-HRC64, while the surface hardness of the area on the frame 10 after coating is applied is HRC58-HRC62, so that the coating can also meet the contact support requirements of the steel ball 40, the inner star wheel and the outer star wheel.

[0058] It should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0059] As indicated in this invention and the claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0060] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0061] The above description is merely a preferred embodiment of the present invention and an explanation of the technical principles employed, and is not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. The scope of the invention is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in the present invention.

Claims

1. A fixed-leaf raceway cage characterized by, The system includes a rigid frame and a flexible coating layer. Recessed areas are formed on the inner and outer walls of the frame, each recessed area covering at least the regions on the inner and outer walls that contact the outer spherical surface of the inner star wheel and the inner spherical surface of the outer star wheel. The coating layer includes a first coating layer and a second coating layer, with the first coating layer cured and deposited within the recessed areas. The frame has a plurality of locating windows evenly distributed along its circumference, with the second coating layer cured and deposited on both sidewalls of each locating window in the circumferential direction of the frame. The bonding structure between the skeleton and the first coating layer is composed of a first arc segment, a second arc segment, and a third arc segment arranged sequentially along its axial direction. The first arc segment and the third arc segment have the same diameter and arc length and are symmetrically arranged about the second arc segment. The diameter of the first arc segment is larger than the diameter of the second arc segment, and the diameter of the first arc segment is 0.015mm-0.02mm larger than the diameter of the second arc segment.

2. The fixed node cage of claim 1, wherein, The skeleton includes a reference portion at both ends in the axial direction. The reference portion is an exposed annular structure, and each reference portion includes the axial end face region of the skeleton.

3. The fixed node cage of claim 2, wherein, The first coating completely fills the area between the reference portions at both ends in the axial direction of the skeleton.

4. A fixed node cage according to any one of claims 1 to 3, wherein The second coating layer includes a contact layer and a buffer layer. The buffer layer has a granular structure and is vulcanized and fixed on the skeleton. The contact layer is cured and disposed on the buffer layer.

5. A manufacturing method for manufacturing the fixed node cage according to any one of claims 1 to 4, characterized by, At least the following steps are included: Shot blasting: The skeleton after carburizing heat treatment is shot blasted using a crawler shot blasting machine. The shot blasting time is 4-6 minutes and the steel shot diameter is 1 mm to remove the oxide scale and some residual stress on the surface of the skeleton after carburizing. Cleaning: After shot blasting, the skeleton undergoes degreasing, cleaning, pickling, neutralization cleaning, phosphating and cleaning processes to form a rough oxide film on the skeleton surface. Coating: Place the phosphated skeleton on the coating fixture, preheat to 100℃-160℃, and then bond the coating medium to the skeleton of the cage by extrusion injection molding or spraying. The extrusion or spraying temperature is 360℃-380℃, and the temperature is rapidly reduced after coating. Grinding: The inner and outer spherical surfaces of the cage are ground using a grinding machine. After dressing the grinding wheel with a diamond roller, the inner and outer spherical surfaces of the cage are further ground. The inner and outer spherical surfaces of the cage are ground into a three-segment arc structure with the diameter of the two end regions being larger than the diameter of the middle region in the axial direction.

6. The production method according to claim 5, wherein In the cleaning step, the degreasing cleaning process uses an ultrasonic cleaner to perform ultrasonic cleaning on the skeleton using a degreasing cleaning solution at 45℃-55℃ as the medium. The pickling process uses 8%-12% hydrochloric acid and pickles for 1 minute at a temperature not exceeding 30°C; The phosphating process uses a zinc-based or manganese-based phosphating solution with a concentration of 5%-7% and a pH of 2.0-3.0, and is phosphating at a temperature of not less than 10°C for 10-15 minutes.

7. The production method according to claim 6, wherein In the neutralization and cleaning process and the cleaning process after phosphating, three independent water tanks are used: a neutralization tank, an immersion tank, and a rinsing tank. The neutralization tank is filled with a 3% sodium hydroxide solution for acid-base neutralization, and the rinsing tank is filled with flowing water at a flow rate of 4L / min-6L / min for impurity removal.

8. The production method according to claim 5, wherein In the coating step, the hardness of the skeleton body is HRC60-HRC64, and the surface hardness of the coated area on the skeleton is HRC58-HRC62.

Images