High-speed, long-life single-row cylindrical roller bearing transmission structure

Abstract

This utility model relates to a high-speed, long-life single-row cylindrical roller bearing transmission structure, belonging to the technical field of bearing transmission structures. It includes a housing, with a connecting flange on one side. An output shaft extending from the connecting flange is located inside the housing, and an end cover is located at the other end of the output shaft. A motor input gear shaft is located at the lower end of the output shaft, and a transmission gear meshing with the motor input gear shaft is mounted on the output shaft. Roller bearings are installed between the output shaft and the connecting flange, between the output shaft and the end cover, and between the motor input gear shaft and the housing. Each roller bearing includes an outer ring, an inner ring inside the outer ring, and a cage between the outer and inner rings. The cage has several cylindrical rollers arranged in a ring and movably engaged with the cage. Through the key design of a split-type copper cage and an outer ring oil groove, combined with reliable sealing and fixing methods, the problems of heat generation and rapid wear of traditional bearings at high speeds are solved, thereby improving the performance and lifespan of the entire transmission unit.

Description

Technical Field

[0001] This utility model relates to the field of bearing transmission structure technology, specifically to a high-speed, long-life single-row cylindrical roller bearing transmission structure. Background Technology

[0002] Single-row cylindrical roller bearings are widely used in mechanical transmission equipment such as motors, machine tool spindles, and reducers due to their high load-bearing capacity and radial stiffness. With the development of industrial equipment towards higher speeds and precision, higher requirements are being placed on the speed performance and service life of single-row cylindrical roller bearings.

[0003] The NU-type structure in a single-row cylindrical roller bearing typically consists of an outer ring (with double flanges), an inner ring, rollers, and a cage. Transmission is achieved through the rolling of cylindrical rollers between the inner and outer ring raceways. Traditional single-row cylindrical roller bearings have the following shortcomings: Because single-row cylindrical roller bearings primarily bear radial forces, the machining of conventional outer ring flanges focuses more on dimensional control and surface hardness than on the microscopic textures achieved through ultra-precision machining. Therefore, the flanges are only ground and not ultra-precision machined, resulting in a relatively high surface roughness, typically Ra 0.8-1.6 μm. During bearing operation, the high coefficient of friction between the flanges and roller end faces easily generates heat, limiting bearing speed increases and accelerating wear on both the flanges and rollers, thus shortening bearing life.

[0004] The cage is mostly made of integral steel or ordinary plastic. Integral steel cages are heavy and have a large centrifugal force when running at high speeds. They are prone to friction and collision with the rollers or inner and outer rings, resulting in greater noise and wear. Ordinary plastic cages have poor high temperature resistance and impact resistance. Under heavy load or continuous high temperature conditions, they are prone to deformation and cracking, causing the rollers to fall off and leading to bearing failure.

[0005] The separate copper cage consists of a cage seat and a cage cover. During assembly, the two are usually fixed by electric riveting using a single-point riveting method. It is necessary to complete the riveting of 10 to 16 riveting points one by one. The assembly time for a single set is ≥30 seconds. This not only results in low production efficiency, but also makes the cage prone to deformation due to uneven riveting pressure, which affects the bearing assembly accuracy. Summary of the Invention

[0006] This utility model mainly addresses the shortcomings of existing technologies by providing a high-speed, long-life single-row cylindrical roller bearing transmission structure. Through the key design of a split copper cage and an outer ring oil groove, combined with reliable sealing and fixing methods, it solves the problems of easy overheating and rapid wear of traditional bearings at high speeds, thereby improving the performance and lifespan of the entire transmission unit.

[0007] The above-mentioned technical problems of this utility model are mainly solved by the following technical solutions: A high-speed, long-life single-row cylindrical roller bearing transmission structure includes a housing, a connecting flange on one side of the housing, an output shaft extending from the connecting flange inside the housing, an end cap fixed to the housing by plug-in bolts at the other end of the output shaft, a motor input gear shaft at the lower end of the output shaft, and a transmission gear meshing with the motor input gear shaft on the output shaft. Roller bearings are installed between the output shaft and the connecting flange, between the output shaft and the end cap, and between the motor input gear shaft and the housing. Each roller bearing includes an outer ring, an inner ring inside the outer ring, and a cage between the outer and inner rings. The cage has a plurality of cylindrical rollers arranged in a ring and movably engaged with the cage.

[0008] Preferably, the cage includes a cage seat, and the cage seat has a cage cover on its side that limits the left and right movement of the cylindrical roller and is riveted to the cage seat.

[0009] Preferably, the cage base and cage cover are made of copper, and the cage is composed of a separate structure of the cage base and cage cover.

[0010] Preferably, the inner wall of the outer ring is provided with an assembly groove for assembling the cylindrical rollers, and both sides of the assembly groove are provided with arc-shaped oil grooves. The function of the arc-shaped oil grooves is: Oil storage: storing lubricating grease.

[0011] Oil distribution: When the bearing rotates, the centrifugal force evenly distributes the lubricating oil to the contact surface of the rollers and raceways, forming a stable oil film.

[0012] Chip removal: It can contain tiny grinding chips generated during operation and prevent them from scratching the raceway.

[0013] Heat dissipation: Increasing the flow of lubricating oil helps to remove the heat generated by the high-speed operation of the bearing.

[0014] Preferably, each of the roller bearings has a retaining ring on its outer end that is respectively fitted into a groove to the housing, connecting flange, or end cover. The retaining ring securely fixes the bearing to the housing, connecting flange, or end cover by fitting into the groove.

[0015] Preferably, a dustproof ring is provided between the outer end of the connecting flange and the output shaft.

[0016] Preferably, the upper end of the housing is provided with a top cover that is bolted and fixed to the housing. This facilitates gear installation, lubrication, and internal maintenance.

[0017] This invention can achieve the following effects: This invention provides a high-speed, long-life single-row cylindrical roller bearing transmission structure. Compared with the prior art, it solves the problems of easy overheating and rapid wear of traditional bearings at high speeds through the key design of a split copper cage and an outer ring oil groove, combined with reliable sealing and fixing methods, thereby improving the performance and lifespan of the entire transmission unit.

[0018] High-speed adaptability: Utilizing a split-type copper cage, it offers excellent friction reduction and heat dissipation. The rollers are dynamically engaged within the cage, reducing drag resistance at high speeds. The outer ring features arc-shaped oil grooves to ensure ample lubrication and heat dissipation.

[0019] Long service life: An excellent lubrication system (arc-shaped oil grooves) and sealing system (dust seals) effectively reduce wear and contamination. The brass cage itself has good wear resistance, extending its lifespan. A robust support system (multi-point support, retaining rings) ensures smooth operation and reduces vibration and impact.

[0020] Compact structure and easy assembly: Gears, bearings, and housing are highly integrated into a single functional unit. The design, including a split cage, snap ring fixing, and plug-in bolt connections, simplifies the production and assembly process.

[0021] High reliability: Multiple dustproof and anti-loosening designs (such as dustproof rings and retaining rings), and a well-considered overall structural design, making it suitable for long-term stable operation in industrial environments. Attached Figure Description

[0022] Figure 1 This is a structural cross-sectional view of the present invention.

[0023] Figure 2 This is a structural cross-sectional view of the cylindrical roller bearing in this utility model.

[0024] Figure 3 This is a cross-sectional view of the outer ring structure in this utility model.

[0025] Figure 4 This is a schematic diagram of the cage structure in this utility model.

[0026] In the diagram: 1. Housing; 2. Top cover; 3. Transmission gear; 4. Connecting flange; 5. Roller bearing; 6. Dust seal; 7. Output shaft; 8. Motor input gear shaft; 9. Snap ring; 10. End cover; 11. Outer ring; 12. Cylindrical roller; 13. Cage; 14. Inner ring; 15. Assembly groove; 16. Arc oil groove; 17. Cage seat; 18. Cage cover. Detailed Implementation

[0027] The technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0028] Example: Figure 1-4 As shown, a high-speed, long-life single-row cylindrical roller bearing transmission structure includes a housing 1, with a top cover 2 fixed to the housing 1 by plug-in bolts. A connecting flange 4 is located on one side of the housing 1, and an output shaft 7 extending from the connecting flange 4 is located inside the housing 1. A dustproof ring 6 is provided between the outer end of the connecting flange 4 and the output shaft 7. An end cover 10, fixed to the housing 1 by plug-in bolts, is located at the other end of the output shaft 7. A motor input gear shaft 8 is located at the lower end of the output shaft 7, and a transmission gear 3 meshes with the motor input gear shaft 8 on the output shaft 7. Roller bearings 5 ​​are provided between the output shaft 7 and the connecting flange 4, between the output shaft 7 and the end cover 10, and between the motor input gear shaft 8 and the housing 1. Each roller bearing 5 has a retaining ring 9 on its outer end that is respectively inserted into a groove of the housing 1, the connecting flange 4, and the end cover 10.

[0029] The roller bearing 5 includes an outer ring 11, within which is an inner ring 14. A cage 13 is provided between the outer ring 11 and the inner ring 14. The cage 13 has 12 cylindrical rollers 12 arranged in a single row and movably engaged with the cage 13. The rollers 12 and the cage 13 are not interference-fitted, but have a small clearance. This allows the rollers to make slight self-alignment adjustments during high-speed rotation, reducing drag torque and facilitating the entry of lubricating oil. The inner wall of the outer ring 11 has mounting grooves 15 for assembling the cylindrical rollers 12, and arc-shaped oil grooves 16 are provided on both sides of the mounting grooves 15. The cage 13 includes a cage seat 17, and a cage cover 18 is provided on the side of the cage seat 17 to limit the left and right movement of the cylindrical rollers 12 and is riveted to the cage seat 17. The cage base 17 and cage cover 18 are made of copper, and the cage 13 is composed of a separate structure of the cage base 17 and the cage cover 18.

[0030] In summary, this high-speed, long-life single-row cylindrical roller bearing transmission structure, through the key design of a split copper cage and an outer ring oil groove, combined with reliable sealing and fixing methods, solves the problems of easy overheating and rapid wear of traditional bearings at high speeds, thereby improving the performance and lifespan of the entire transmission unit.

[0031] Exceptional high-speed performance: Low friction: copper cage + movable roller clamp = minimal drag resistance.

[0032] High stability: The even distribution of 12 rollers ensures extremely high rotational accuracy and dynamic balance, reducing vibration at high speeds.

[0033] High-efficiency heat dissipation: The high thermal conductivity of the arc-shaped oil groove and copper cage effectively solves the core problem of high-speed operation - temperature rise.

[0034] Extra-long service life: Continuous lubrication: The dual-groove design ensures continuous and effective lubrication, reducing wear at its source.

[0035] High-reliability sealing: The excellent sealing of the dust seal and the overall housing provides a clean internal working environment for the bearing.

[0036] Robust support: The precise securing of the retaining ring prevents premature failure due to bearing loosening.

[0037] Precision manufacturing and assembly: From the riveting connection of the split cage to the precise arrangement of 12 rollers and the slotted fixing of the retaining ring, every detail points to the design concept of precision manufacturing and easy assembly, ensuring product consistency and quality.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] In summary, the above description is only a specific embodiment of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A high-speed long-life single-row cylindrical roller bearing drive structure comprising a box (1), characterized in that: The housing (1) has a connecting flange (4) on one side. The housing (1) has an output shaft (7) extending from the connecting flange (4). The other end of the output shaft (7) has an end cover (10) that is fixed to the housing (1) by plug-in bolts. The lower end of the output shaft (7) has a motor input gear shaft (8). The output shaft (7) has a transmission gear (3) that meshes with the motor input gear shaft (8). Roller bearings (5) are provided between the output shaft (7) and the connecting flange (4), between the output shaft (7) and the end cover (10), and between the motor input gear shaft (8) and the housing (1). The roller bearing (5) includes an outer ring (11). An inner ring (14) is provided inside the outer ring (11). A cage (13) is provided between the outer ring (11) and the inner ring (14). A plurality of cylindrical rollers (12) are arranged in a ring and are movably engaged with the cage (13).

2. The high-speed, long-life single-row cylindrical roller bearing transmission structure according to claim 1, characterized in that: The cage (13) includes a cage seat (17), and the cage seat (17) has a cage cover (18) on its side that limits the left and right movement of the cylindrical roller (12) and is riveted to the cage seat (17).

3. The high-speed, long-life single-row cylindrical roller bearing transmission structure according to claim 2, characterized in that: The cage base (17) and cage cover (18) are made of copper, and the cage (13) is composed of a separate structure of the cage base (17) and the cage cover (18).

4. The high-speed, long-life single-row cylindrical roller bearing transmission structure according to claim 1, characterized in that: The inner wall of the outer ring (11) is provided with an assembly groove (15) for assembling cylindrical rollers (12), and both sides of the assembly groove (15) are provided with arc-shaped oil grooves (16).

5. The high-speed, long-life single-row cylindrical roller bearing transmission structure according to claim 1, characterized in that: The outer ends of the roller bearings (5) are provided with retaining rings (9) that are respectively inserted into the housing (1), the connecting flange (4), and the end cover (10).

6. The high-speed, long-life single-row cylindrical roller bearing transmission structure according to claim 1, characterized in that: A dustproof ring (6) is provided between the outer end of the connecting flange (4) and the output shaft (7).

7. The high-speed, long-life single-row cylindrical roller bearing transmission structure according to claim 1, characterized in that: The upper end of the box (1) is provided with a top cover (2) that is fixed to the box (1) by a bolt.

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