Slewing bearing axial raceway cage

Abstract

This utility model discloses a retainer for the axial raceway of a slewing bearing, comprising a frame body with a plurality of pockets spaced apart on the frame body. Pocket frames are respectively provided on the frame body at the positions of the pockets. Each pocket frame includes a ring body and a connecting arm. The ring body is inserted into the pocket and fits with a clearance fit. The connecting arm is abutted on the side wall of the pocket, and the free end of the connecting arm is bent to form a retaining wall. A mating groove is formed between the retaining wall and the ring body, and the side wall of the frame body fits into the mating groove. Its structure is simple, its performance is stable, and while increasing the wear resistance of the structure, it also has good toughness and self-lubricating properties, improving the overall performance of the structure.

Description

Technical Field

[0001] This utility model relates to a retainer for the axial raceway of a slewing bearing. Background Technology

[0002] With the development of the national economy, slewing bearings are increasingly used in high-speed applications. Applications such as machine tool rotary tables not only require high speeds but also high precision, high rigidity, and low noise. Due to these requirements, the application of high-precision, high-speed three-row roller slewing bearings has increased. However, in existing bearings, the cage structure, due to vibration or prolonged use, can cause the cage to shake and tilt, leading to collisions or friction between the cage edge and the bearing housing. This results in abnormal noise, affects the smooth operation of the bearing, and significantly accelerates cage wear, reducing the bearing's service life. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a cage for the axial raceway of a slewing bearing. It has a simple structure, stable performance, and increases the wear resistance of the structure while possessing good toughness and self-lubricating properties, thereby improving the overall performance of the structure.

[0004] To achieve the above objectives, this utility model provides a retainer for the axial raceway of a slewing bearing, comprising a frame body with a plurality of pockets spaced apart on the frame body, and pocket brackets respectively provided on the frame body at the positions of the pockets. Each pocket bracket includes a ring body and a connecting arm. The ring body is inserted into the pocket and fits with the pocket with a clearance. The connecting arm is abutted on the side wall of the pocket, and the free end of the connecting arm is bent to form a retaining wall. A mating groove is formed between the retaining wall and the ring body, and the side wall of the frame body fits into the mating groove.

[0005] The beneficial effects of this design are as follows: This configuration, through a composite assembly method of "clearance fit + slot fit," forms a stable and dynamically adaptable overall structure between the frame and the pocket frame. The clearance fit between the ring body and the pocket allows for a certain degree of relative micro-movement to buffer impact loads, while the mating groove formed by the connecting arm and the retaining wall precisely engages the side wall of the frame, ensuring coordinated movement under high-speed rotation and heavy-load conditions and preventing structural failure due to loosening. Ordinary carbon structural steel Q235 is used as the frame base material, providing rigid support for the overall structure due to its good machinability and cost-effectiveness. The pocket frame, preferably made of POM (polyoxymethylene) material, compensates for the material deficiencies of existing frames with its high hardness, low coefficient of friction, and self-lubricating properties. During the operation of the slewing bearing, the direct friction between the rollers and the frame is transferred to the surface of the pocket frame. The self-lubricating properties of POM material significantly reduce contact stress, and its good toughness effectively absorbs the vibration and impact generated by the roller movement, reducing the frame wear rate by more than 60%. This structural design significantly extends the service life of the slewing bearing, reducing equipment maintenance frequency and costs. Simultaneously, reduced wear directly suppresses abnormal noises generated by metal-to-metal friction, effectively improving the noise environment during equipment operation and demonstrating significant practical value.

[0006] As a further feature of this invention, the side wall of the ring body is also provided with an abutting flange, which abuts against the edge of the pocket.

[0007] The beneficial effects of this design are as follows: This configuration ensures the contact flange tightly fits against the pocket edge, forming a mechanical limiting structure that significantly restricts the radial and axial sway of the pocket bracket. When the slewing bearing bears complex loads, the clamping action between the flange and the pocket edge concentrates the dispersed stress and guides it towards the frame, preventing displacement or deflection of the pocket bracket due to uneven local stress. This design not only ensures the positional accuracy of the pocket bracket under high-speed operation and frequent start-stop conditions but also further optimizes the contact stability between the rollers and the pocket bracket. Combined with the wear-resistant properties of POM material, it reduces abnormal wear caused by swaying, enabling the overall structure to maintain higher reliability and stability during continuous operation of heavy machinery.

[0008] As a further feature of this invention, a lubrication groove is provided on the bottom surface of the mating groove along the width direction of the ring body.

[0009] The beneficial effects of this design are as follows: This configuration, combined with the lubrication grooves on the bottom surface of the bearing, is an ingenious design that enhances the performance of the cage. Distributed along the width of the ring, it effectively stores lubricating oil. During the operation of the slewing bearing, the lubricating oil is evenly distributed across all contact surfaces by the rolling and friction of the rollers, greatly reducing frictional resistance and wear. Simultaneously, the small spaces created by the lubrication grooves provide a floating margin during relative movement between the cage and the retainer. When the equipment encounters impact loads or operational deviations, the structure can be fine-tuned through the buffering effect of the lubrication grooves, avoiding stress concentration caused by rigid contact. This design, combining lubrication and structural buffering functions, ensures both effective lubrication and improved structural stability, allowing the slewing bearing to maintain efficient operation even under prolonged high-load conditions.

[0010] As a further feature of this invention, adjacent pocket frames are arranged in opposite directions.

[0011] The beneficial effects of this design are as follows: This mirror-symmetrical layout allows the brackets to completely surround the slewing bearing from multiple directions. When the slewing bearing is running, the radial and axial forces generated by the rollers are evenly distributed across the brackets in different orientations, preventing excessive stress and wear on one side of the bearing. For example, under heavy loads, the opposing brackets can simultaneously buffer the reverse forces applied by the rollers, creating mechanical balance and preventing deformation or rapid localized wear due to uneven stress. Simultaneously, this symmetrical structure effectively suppresses vibration and misalignment during operation, further improving the slewing bearing's operational accuracy and service life, demonstrating a deep integration of structural design and mechanical principles.

[0012] As a further feature of this invention, the four corner edges of the pocket are provided with pocket grooves.

[0013] The advantages of this design are as follows: It allows for greater lubrication capacity during equipment assembly. During the operation of the slewing bearing, the lubricating oil stored in the pocket is continuously and stably released as the rollers roll and compress, forming a continuous lubricating film and effectively reducing the coefficient of friction between the rollers and the pocket. Simultaneously, the unique positioning of the pocket facilitates the diffusion of lubricating oil to areas of concentrated contact stress, preventing localized overheating and wear due to insufficient lubrication. Furthermore, the pocket can buffer the impact between the rollers and the pocket edges to a certain extent, reducing metal fatigue and damage caused by rigid contact, further improving the overall reliability and service life of the cage, and ensuring stable operation of the slewing bearing under complex working conditions. Attached Figure Description

[0014] Figure 1 This is a structural diagram showing the location of an embodiment of the present utility model;

[0015] Figure 2This is a schematic diagram of the pocket frame in an embodiment of the present utility model. Detailed Implementation

[0016] An example of the implementation of the cage of the axial raceway of the slewing bearing of this utility model. Figures 1 to 2 As shown: The device includes a frame 1 with several pockets 11 spaced apart. Pocket frames 2 are positioned corresponding to the pockets 11 on the frame 1. Each pocket frame 2 includes a ring 21 and a connecting arm 22. The ring 21 is inserted into the pocket 11 and has a clearance fit. The connecting arm 22 is positioned against the side wall of the pocket 11, and its free end is bent to form a retaining wall 23. A mating groove is formed between the retaining wall 23 and the ring 21, and the side wall of the frame 1 fits into this groove. The advantage of this configuration is that the frame 1 and pocket frames 2, through a composite assembly method of "clearance fit + slot fit," form a stable and dynamically adaptable overall structure. The clearance fit between the ring 21 and the pocket 11 allows for a certain degree of relative micro-movement to buffer impact loads, while the mating groove formed by the connecting arm 22 and the baffle 23 precisely engages the side wall of the frame 1, ensuring coordinated movement under high-speed rotation and heavy-load conditions and preventing structural failure due to loosening. Ordinary carbon structural steel Q235 is used as the base material for the frame 1, providing rigid support for the overall structure due to its good machinability and cost-effectiveness. The pocket frame 2, preferably made of POM (polyoxymethylene) material, compensates for the material defects of the existing frame 1 with its high hardness, low coefficient of friction, and self-lubricating properties. During the operation of the slewing bearing, the direct friction between the rollers and the frame 1 is transferred to the surface of the pocket frame 2. The self-lubricating properties of POM material significantly reduce contact stress, and its good toughness effectively absorbs the vibration and impact generated by the roller movement, reducing the wear rate of the frame 1 by more than 60%. This structural design significantly extends the service life of the slewing bearing and reduces equipment maintenance frequency and costs. At the same time, the reduction in wear directly suppresses the abnormal noise generated by metal friction, effectively improving the noise environment of equipment operation and possessing significant practical value.

[0017] As a further feature of this embodiment, the sidewall of the ring body 21 is also provided with an abutting flange 24, which abuts against the edge of the pocket 11. The beneficial effect of this design is that the abutting flange 24 tightly fits against the edge of the pocket 11, forming a mechanical limiting structure that greatly restricts the radial and axial sway of the pocket frame 2. When the slewing bearing is subjected to complex loads, the abutting action between the flange and the edge of the pocket 11 concentrates the dispersed stress and guides it to the frame body 1, preventing displacement or deflection of the pocket frame 2 due to uneven local stress. This design not only ensures the positional accuracy of the pocket frame 2 under high-speed operation and frequent start-stop conditions, but also further optimizes the contact stability between the roller and the pocket frame 2. Combined with the wear-resistant properties of POM material, it reduces abnormal wear caused by swaying, enabling the overall structure to maintain higher reliability and stability during continuous operation of heavy machinery.

[0018] As a further feature of this embodiment, a lubrication groove 25 is provided on the bottom surface of the mating groove along the width direction of the ring body 21. The beneficial effect of this design is that the lubrication groove 25 on the bottom surface of the mating groove is a clever design that enhances the performance of the cage. Its distribution along the width direction of the ring body 21 effectively stores lubricating oil. During the operation of the slewing bearing, the lubricating oil can be evenly covered on all contact surfaces by the rolling and friction of the rollers, greatly reducing frictional resistance and wear. Simultaneously, the small space formed by the lubrication groove 25 provides a floating margin during the relative movement of the frame body 1 and the pocket frame 2. When the equipment encounters impact loads or operational deviations, the structure can be finely adjusted through the buffering effect of the lubrication groove 25, avoiding stress concentration caused by rigid contact. This design, which combines lubrication and structural buffering functions, ensures both lubrication effectiveness and structural stability, allowing the slewing bearing to maintain efficient operation even under long-term high-load work.

[0019] As a further feature of this embodiment, adjacent pocket frames 2 are arranged with opposite orientations. The advantage of this arrangement is that, through a mirror-symmetrical layout, the pocket frames 2 can comprehensively surround the frame 1 from multiple directions. When the slewing bearing is running, the radial and axial forces generated by the rollers are evenly distributed across the pocket frames 2 with different orientations, preventing the frame 1 from bearing excessive stress and wear on one side. For example, under heavy-load conditions, the oppositely positioned pocket frames 2 can simultaneously buffer the opposing forces applied by the rollers, achieving mechanical balance and preventing deformation or rapid localized wear of the frame 1 due to uneven stress. Simultaneously, this symmetrical structure effectively suppresses vibration and offset during operation, further improving the operating accuracy and service life of the slewing bearing, demonstrating a deep integration of structural design and mechanical principles.

[0020] As a further feature of this embodiment, grooves 12 are provided at the four corner edges of the pocket 11. The advantages of this design are: it allows for greater capacity of lubricating oil during equipment assembly; during the operation of the slewing bearing, the lubricating oil stored in the grooves 12 is continuously and stably released as the rollers roll and compress, forming an uninterrupted lubricating film and effectively reducing the coefficient of friction between the rollers and the pocket 11. Simultaneously, the unique positioning of the grooves 12 facilitates the diffusion of lubricating oil to areas of concentrated contact stress, preventing localized overheating and wear due to insufficient lubrication. Furthermore, the grooves 12 can buffer the collision between the rollers and the edges of the pocket 11 to a certain extent, reducing metal fatigue and damage caused by rigid contact, further improving the overall reliability and service life of the cage, and ensuring stable operation of the slewing bearing under complex working conditions.

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

Claims

1. A retainer for the axial raceway of a slewing bearing, comprising a frame body, wherein the frame body is provided with a plurality of pockets at intervals, characterized in that: The frame is provided with pocket frames at the corresponding pocket positions. Each pocket frame includes a ring body and a connecting arm. The ring body is inserted into the pocket and fits with the pocket with a gap. The connecting arm is blocked on the side wall of the pocket. The free end of the connecting arm is bent to form a baffle. A mating groove is formed between the baffle and the ring body. The side wall of the frame fits in the mating groove.

2. The cage for the axial raceway of the slewing bearing according to claim 1, characterized in that: The side wall of the ring body is also provided with an abutting flange, which abuts against the edge of the pocket.

3. The cage for the axial raceway of the slewing bearing according to claim 1, characterized in that: A lubrication groove is provided on the bottom surface of the mating groove along the width direction of the ring body.

4. The cage for the axial raceway of the slewing bearing according to claim 1, characterized in that: Adjacent pocket brackets are arranged with opposite orientations.

5. The cage for the axial raceway of the slewing bearing according to claim 1, characterized in that: The pocket has grooves at its four corner edges.

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