Thin-walled Deep Groove Ball Bearing

I. Product Overview​

Thin-Walled Deep-Groove Ball Bearings (abbreviated as TWDGBB) are a specialized category in the deep-groove ball bearing family, focusing on scenarios with space constraints, lightweight requirements, and high rotational speeds. Through an extreme "ultra-thin wall" design, they serve as core foundational components for the miniaturization and lightweight upgrading of equipment. The wall thickness of their inner and outer rings is reduced by 40%-60% compared to light-duty deep-groove ball bearings of the same inner diameter. With an outer diameter ranging from 10mm to 200mm, an inner diameter covering 5mm to 150mm, and a minimum width of 2mm, their overall weight is 30%-50% lower than that of ordinary bearings. This makes them perfectly suitable for scenarios with strict restrictions on installation space and equipment weight.​

Primarily designed to bear radial loads, these bearings can simultaneously carry bidirectional axial loads equivalent to 15%-25% of the rated radial load. There is no need for additional thrust bearings, which simplifies the transmission structure of the equipment. Although their load-carrying capacity is lower than that of light and medium-duty bearings, they achieve core advantages of low friction (friction coefficient 0.001-0.003) and high rotational speed (limit speed 15,000-50,000 r/min with grease lubrication) in limited space through the "ultra-thin wall integrated forging + ultra-precision cutting" process. They are widely used in consumer electronics, medical devices, precision instruments, and other fields. Some models, through seal and material upgrades, can adapt to light-load environments with moisture and low dust, further expanding their application scope.​

II. Core Structure and Design Features​

1. Precision Structural Composition​

Thin-Walled Deep-Groove Ball Bearings consist of 4 core components, each optimized around "ultra-thinning, lightweight, and high stability" to ensure stable operation in space-constrained scenarios:​

Inner Ring and Outer Ring: Adopt an ultra-thin wall integrated design, with a wall thickness only 40%-60% of that of ordinary bearings of the same specification (e.g., for models with an inner diameter of 10mm, the wall thickness can be 1.2mm-1.8mm). The main material is SUJ2 high-carbon chromium bearing steel, which undergoes "integral quenching + low-temperature tempering" treatment, resulting in a surface hardness of HRC 60-62 to ensure deformation resistance under the thin-walled structure. For scenarios requiring lightweight properties, titanium alloy (TC4) or high-strength aluminum alloy (6061-T6) is used, reducing the weight by an additional 20%-30% compared to steel bearings. The inner diameter of the inner ring and the outer diameter of the outer ring typically have precision grades of P5/P4, and some micro-models reach P3 grade, ensuring precise fitting with shafts and bearing housings and reducing operational vibration.​

Steel Balls (Rolling Elements): Feature a small-diameter, high-density configuration. The diameter of the steel balls is 30%-50% smaller than that of ordinary bearings, and the quantity is increased by 10%-20%. Loads are distributed through multiple contact points to avoid local stress overload on the thin-walled structure. The preferred material is GCr15SiMn high-purity bearing steel, which undergoes "vacuum degassing + precision grinding" treatment, with a roundness error ≤ 0.2μm and a surface roughness Ra ≤ 0.1μm. For high-speed scenarios (rotational speed ≥ 30,000 r/min), silicon nitride ceramic balls are used, with a density only 40% of that of steel balls, significantly reducing rotational inertia and improving speed performance.​

Cage: Designed with the core principles of "lightweight and low friction". For micro-models (inner diameter ≤ 10mm), an integrated injection-molded nylon cage (PA66 + 30% glass fiber) is used, which is lightweight and wear-resistant. For small and medium-sized models (inner diameter 10mm-50mm), an ultra-thin stamped steel cage (SPCC cold-rolled steel sheet, thickness 0.3mm-0.5mm) is selected, with surface galvanization for rust prevention. For some high-precision scenarios, a solid brass cage (HPb59-1) is used to reduce friction and collision between steel balls and the cage, lowering operational noise (no-load noise ≤ 45dB).​

Seals (Optional): Diversified sealing solutions are provided to meet different environmental needs: ① Double-sided dust covers (suffix 2Z): Stamped from 0.15mm-0.3mm ultra-thin steel sheets, suitable for dry and clean scenarios (e.g., inside precision instruments); ② Double-sided contact seals (suffix 2RS): Nitrile rubber (NBR) seal lips, with an IP54 dust and water resistance rating, suitable for humid environments (e.g., bathroom appliances); ③ Double-sided fluororubber seals (suffix 2RS-F): Temperature resistance from -20℃ to +200℃, oil and chemical resistant, suitable for small high-temperature equipment (e.g., micro heating fans).​

2. Key Design Characteristics​

Extreme Space Adaptability: The ultra-thin wall and compact size design enable the same transmission function in 50%-70% of the installation space required by ordinary bearings. For example, in micro camera modules, using a thin-walled bearing with an outer diameter of 8mm and a width of 2mm can save more than 40% of the installation space, facilitating equipment miniaturization.​

Significant Lightweight Advantage: The overall weight is 30%-50% lower than that of ordinary bearings. When combined with lightweight materials (titanium alloy, aluminum alloy), the weight reduction effect is more pronounced, effectively reducing equipment operational inertia and improving start-stop response speed. For instance, using titanium alloy thin-walled bearings in drone motors can reduce motor load by 15%-20% and extend battery life.​

High-Speed Performance: Through the design of small-diameter steel balls, low-friction cages, and ultra-precision raceways, the limit speed reaches 15,000-50,000 r/min with grease lubrication and can be increased to 20,000-60,000 r/min with oil lubrication. It is suitable for high-speed transmission scenarios such as micro motors and high-speed fans, with a temperature rise ≤ 35℃ (ambient temperature 25℃) during high-speed operation.​

Strong Structural Stability: Despite the thin-walled structure, through integrated forging and precision processing, the radial stiffness is increased by more than 30% compared to spliced thin-walled bearings. The radial deformation under rated load is ≤ 0.01mm, ensuring equipment transmission accuracy and avoiding operational deviations caused by deformation.​

III. Main Product Models and Classification​

1. Classification by Size and Precision​

Based on inner diameter range and precision grade, Thin-Walled Deep-Groove Ball Bearings can be categorized as follows to accurately match scenarios with different space requirements:​

2. Classification by Material and Application​

Steel Thin-Walled Bearings (Regular Type): Made of SUJ2 bearing steel, suitable for most light-load, high-speed scenarios such as drone motors and small cooling fans.​

Lightweight Thin-Walled Bearings (L Series): Made of titanium alloy/aluminum alloy, lighter in weight, suitable for weight-sensitive equipment such as portable medical devices and small drones.​

High-Precision Thin-Walled Bearings (P Series): Precision grades P4/P3, suitable for precision transmission scenarios such as laser measuring instruments and micro machine tool spindles.​

Sealed Thin-Walled Bearings (S Series): Equipped with 2RS/2RS-F seals, suitable for humid, low-dust environments such as small bathroom appliances and micro water pumps.​

IV. Core Performance Parameters (General Reference)​

Load-Carrying Capacity: The basic dynamic load rating (Cr) ranges from 0.3kN to 25kN, and the basic static load rating (Cor) ranges from 0.1kN to 12kN, depending on the specific model. For example, Model 6800T (10mm inner diameter) has a Cr of approximately 1.8kN and a Cor of approximately 0.9kN; Model 6203T (17mm inner diameter) has a Cr of approximately 6.5kN and a Cor of approximately 3.2kN.​

Limit Speed: The limit speed is 15,000-50,000 r/min with grease lubrication (e.g., Model 6800T has a limit speed of 30,000 r/min with grease lubrication) and 20,000-60,000 r/min with oil lubrication (e.g., Model 6203T has a limit speed of 25,000 r/min with oil lubrication). Models with ceramic balls have a 15%-20% higher speed than those with steel balls.​

Temperature Adaptability: Conventional steel models with nitrile rubber seals have a temperature range of -30℃ to +120℃; models with fluororubber seals (2RS-F) extend this range to -20℃ to +200℃; models made of titanium alloy can withstand temperatures from -50℃ to +250℃, adapting to extreme high and low-temperature scenarios.​

Radial Clearance: Standard clearance (CN) is provided by default; small clearance (C2) or medium clearance (C3) can be customized according to requirements. The clearance range is 0.003mm-0.02mm. Small clearance (C2) is suitable for high-precision transmission, while medium clearance (C3) is suitable for scenarios with large temperature variations.​

V. Applicable Industries and Typical Applications​

With advantages of "strong space adaptability, lightweight, and high speed", Thin-Walled Deep-Groove Ball Bearings have become key components for the miniaturization of equipment in various fields. Typical applications include:​

Consumer Electronics Industry: Drone motors (e.g., micro multi-rotor drones, suitable for Model 6808T), micro camera modules (e.g., smartphone periscope lenses, suitable for Model 6901T), and small cooling fans (e.g., laptop CPU fans, suitable for Model 608T), facilitating the lightweight and thin design of electronic products.​

Medical Device Industry: Minimally invasive surgical instruments (e.g., laparoscope instrument drive shafts, suitable for Model 6805T-P4), portable testing equipment (e.g., internal transmission of blood glucose analyzers, suitable for Model 6902T), and small massager motors (e.g., eye massagers, suitable for Model 6201T), meeting the high-precision and lightweight requirements of medical equipment.​

Precision Instrument Industry: Laser measuring instruments (e.g., internal gear transmission of handheld laser rangefinders, suitable for Model 6204T-P4), small sensors (e.g., pressure sensor drive shafts, suitable for Model 6802T), and micro machine tools (e.g., extrusion mechanisms of desktop 3D printers, suitable for Model 6003T), ensuring the measurement and transmission accuracy of instruments.​

Other Fields: Small robot joints (e.g., educational robot servos, suitable for Model 6903T), automotive electronic components (e.g., vehicle-mounted camera modules, suitable for Model 6804T), and aviation models (e.g., fixed-wing model engines, suitable for Model 6205T), adapting to various space-constrained light-load transmission scenarios.​

VI. Summary of Product Advantages​

Extreme Space Adaptability: The ultra-thin wall and compact size design enable transmission functions in limited space, facilitating the miniaturization and thinning upgrade of equipment and solving the problem of excessive space occupation by traditional bearings.​

Significant Lightweight Effect: The overall weight is greatly reduced, and the advantage is more obvious when combined with lightweight materials, reducing equipment operational inertia, improving start-stop response speed, and lowering energy consumption.​

High Speed and Low Friction: Low friction coefficient and high-speed performance make it suitable for high-speed transmission scenarios, with low operational noise and small temperature rise, ensuring long-term stable operation of equipment.​

Multi-Scenario Compatibility: Diversified material, seal, and precision options allow adaptation to different environments such as dry, humid, high-temperature, and low-temperature, meeting the needs of consumer electronics, medical, and instrument fields, with strong adaptability.​

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