Light-duty Angular Contact Ball Bearing

I. Product Overview​

Light-Duty Angular Contact Ball Bearings (abbreviated as LDACBB) are a core category within the angular contact ball bearing family, tailor-made for scenarios requiring high-speed, light-load, high-precision positioning, and low-energy transmission. Their core competitiveness lies in the triple characteristics of "lightweight structure + angular contact composite load-bearing + high-precision transmission" - through optimized thin-walled structures and lightweight material applications, they reduce the bearing weight and moment of inertia by 20%-35% compared to standard angular contact ball bearings while maintaining basic radial and axial load-bearing capabilities. Relying on specific contact angle designs, they can simultaneously bear radial and unidirectional axial loads; when installed in pairs (back-to-back, face-to-face, or in series), they can meet bidirectional axial positioning requirements. Covering precision grades from P5 to P2, they maintain micron-level transmission precision at high speeds, completely solving the industry pain points of precision equipment such as "high resistance during high-speed operation, low positioning accuracy, and high energy consumption".​

The outer diameter of these bearings ranges from 10mm to 120mm, with an inner diameter spanning 5mm to 60mm. The basic dynamic load rating is 2kN-35kN, and the basic static load rating is 1kN-18kN. The limiting speed under grease lubrication can reach 15,000-40,000 r/min (some high-precision models can exceed 50,000 r/min with oil mist lubrication), far higher than that of standard angular contact ball bearings (with a typical limiting speed of 8,000-20,000 r/min for conventional models). Contact angles are categorized into three types: 15° (Type C), 25° (Type AC), and 30° (Type B), adapting to scenarios with different axial load requirements. They are widely used in precision transmission systems with strict demands on speed, precision, and lightweight design, such as CNC machine tool spindles, precision servo motors, medical equipment (e.g., CT scanners), and aerospace devices (e.g., small navigation components).​

Compared with standard angular contact ball bearings, targeted optimizations have been made to balance structural strength and precision: finite element analysis is used to optimize the wall thickness distribution of inner and outer rings, preventing reduced deformation resistance caused by thin-walling; ultra-precision grinding is applied to improve the surface precision of raceways and steel balls, resulting in an operating vibration acceleration of ≤ 2m/s² and noise of ≤ 45dB. Their service life under high-speed, light-load conditions is extended by more than 40%, and energy consumption is reduced by 15%-20%, perfectly adapting to the "high-efficiency, low-consumption, and long-life" transmission needs of precision equipment.​

II. Core Structure and Design Features​

1. Precision Structural Composition​

The four core components of LDACBB are optimized for "lightweight, high-precision, and low-friction" requirements, ensuring reliable operation under high-speed, precision working conditions:​

Inner and Outer Rings: Adopt a thin-walled symmetrical structure, with the wall thickness of inner and outer rings reduced by 20%-30% compared to standard angular contact ball bearings (e.g., for a 7000 series bearing with an inner diameter of 10mm, the inner ring wall thickness is reduced from 2.5mm to 1.8mm, and the outer ring wall thickness from 3mm to 2.2mm). Finite element analysis is used to optimize wall thickness distribution, focusing on strengthening the raceway area to prevent deformation during high-speed operation. The material used is high-purity SUJ2 bearing steel (purity ≥ 99.95%), which undergoes "vacuum degassing + integral quenching + ultra-precision grinding" processes. The surface hardness reaches HRC 62-65, the raceway surface roughness is Ra ≤ 0.02μm, and the roundness error is ≤ 0.5μm. For models used in ultra-high-speed scenarios (e.g., aerospace equipment), Si₃N₄ ceramic composite materials are adopted, reducing weight by 40% compared to steel bearings, doubling thermal conductivity, and significantly enhancing high-temperature resistance.​

Rolling Elements (Steel Balls): High-precision small-diameter steel balls are used, with a diameter 15%-20% smaller than that of standard angular contact ball bearings (e.g., for a 7005 model bearing, the steel ball diameter is reduced from 7.144mm to 6mm). This reduces the contact area between rolling elements and raceways, lowering friction losses. The material is GCr15SiMn ultra-fine grain bearing steel, processed through "precision forging + multi-stage grinding + nano-level polishing". The roundness error is ≤ 0.1μm, and the surface roughness is Ra ≤ 0.01μm, ensuring uniform contact with raceways and preventing vibration during high-speed operation. For some high-precision models, ceramic balls (Si₃N₄) are used, with a friction coefficient as low as 0.001 and wear resistance improved by 3 times.​

Cage: Lightweight and high-strength materials are used. The mainstream models adopt PA66 + 30% glass fiber reinforced nylon cages - 50% lighter than brass cages, with a friction coefficient of 0.0015-0.002 and an impact resistance of 80kJ/m², suitable for medium-high speed scenarios (rotational speed ≤ 30,000 r/min). For ultra-high-speed scenarios (rotational speed ＞ 30,000 r/min), titanium alloy cages (TC4 material) are used, featuring high strength and good heat dissipation, capable of withstanding high temperatures (≤ 300℃) and high-frequency vibration. The cage pockets adopt a "shallow pocket + guide surface" design, with the clearance between pockets and steel balls controlled at 0.05mm-0.1mm, preventing steel ball movement during high-speed operation and ensuring stable force transmission.​

Sealing Structure (Optional): Some models are equipped with thin contact seals (suffix 2RS) or non-contact dust covers (suffix 2Z). The 2RS seals are made of nitrile rubber (NBR) with a seal lip thickness of only 0.3mm-0.5mm, ensuring sealing performance while minimizing friction resistance, suitable for humid, low-dust scenarios. The 2Z dust covers are made of 0.15mm-0.2mm thick cold-rolled steel plates, fixed by laser welding, providing good dust resistance without affecting rotational speed, suitable for dry, precision scenarios. All sealing structures adopt a "lightweight design" to avoid increasing bearing weight and rotational resistance.​

2. Key Design Characteristics​

Lightweight and Low Moment of Inertia: The combination of thin-walled inner/outer rings, lightweight cages, and small-diameter rolling elements reduces bearing weight by 20%-35% and moment of inertia by 30%-40% compared to standard models. This reduces centrifugal force during high-speed operation and lowers friction losses by 15%-20%, not only improving the acceleration response speed of equipment (e.g., reducing the start-stop time of servo motors by 25%) but also cutting energy consumption, adapting to the "high-efficiency and low-consumption" needs of precision equipment.​

Contact Angle and Composite Load-Bearing Capacity: Three types of contact angles are designed based on axial load requirements:​

15° (Type C): Weak axial load-bearing capacity (axial rated dynamic load is 0.3-0.4 times the radial load), suitable for scenarios dominated by radial loads with small axial loads (e.g., radial support of CNC machine tool spindles);​

25° (Type AC): Moderate axial load-bearing capacity (axial rated dynamic load is 0.5-0.6 times the radial load), suitable for scenarios with balanced radial and axial loads (e.g., precision motor rotors);​

30° (Type B): Strong axial load-bearing capacity (axial rated dynamic load is 0.7-0.8 times the radial load), suitable for scenarios with large axial loads (e.g., axial positioning of medical equipment).​

All three contact angles enable "radial + unidirectional axial" composite load-bearing, eliminating the need for additional thrust bearings.​

High-Precision Transmission and Low Vibration: Precision grades cover P5 (dimensional tolerance ≤ ±5μm, geometric tolerance ≤ ±3μm), P4 (dimensional tolerance ≤ ±3μm, geometric tolerance ≤ ±2μm), and P2 (dimensional tolerance ≤ ±1μm, geometric tolerance ≤ ±0.5μm). Ultra-precision grinding of raceways and steel balls ensures micron-level contact precision. During high-speed operation, the vibration acceleration is ≤ 2m/s² and noise is ≤ 45dB (compared to ≥ 3m/s² vibration acceleration and ≥ 55dB noise for standard models), effectively avoiding vibration interference with precision transmission (e.g., improving the machining accuracy of CNC machine tools by 0.01mm-0.02mm).​

Paired Installation and Bidirectional Positioning: Bidirectional axial positioning is achieved through three paired installation methods: "back-to-back (DB), face-to-face (DF), and tandem (DT)":​

DB installation (outer ring wide sides facing each other): Strong resistance to overturning torque, suitable for scenarios with large radial loads and requiring stable support (e.g., machine tool spindles);​

DF installation (outer ring narrow sides facing each other): High axial stiffness, suitable for scenarios with large axial load fluctuations (e.g., precision pressure equipment);​

DT installation (outer ring wide side facing narrow side): Capable of withstanding larger unidirectional axial loads, suitable for scenarios with large axial thrust (e.g., small aircraft engine components).​

The precision consistency of paired installations is guaranteed by factory matching, eliminating the need for on-site adjustment by users and simplifying the assembly process.​

III. Main Product Models and Classification​

1. Classification by Contact Angle​

2. Classification by Precision Grade​

Grade P5: Dimensional tolerance ≤ ±5μm, geometric tolerance ≤ ±3μm. Suitable for general precision scenarios (e.g., standard CNC machine tools, small precision motors), with moderate cost and high cost-effectiveness.​

Grade P4: Dimensional tolerance ≤ ±3μm, geometric tolerance ≤ ±2μm. Suitable for high-precision scenarios (e.g., high-precision CNC machine tool spindles, precision medical equipment), capable of meeting micron-level transmission requirements.​

Grade P2: Dimensional tolerance ≤ ±1μm, geometric tolerance ≤ ±0.5μm. Suitable for ultra-precision scenarios (e.g., aerospace equipment, semiconductor processing equipment). Special processes and testing are required to ensure precision, resulting in a higher price.​

3. Classification by Installation and Sealing Method​

Open Light-Duty Angular Contact Ball Bearings (No Suffix): No sealing/dust-proof structure, with the lightest weight and minimal rotational resistance. Suitable for dry, clean scenarios with independent lubrication systems (e.g., high-precision machine tool spindles with oil mist lubrication).​

Light-Duty Angular Contact Ball Bearings with Dust Covers (Suffix 2Z): Equipped with double-sided thin steel dust covers, providing good dust resistance without affecting rotational speed or precision. Suitable for dry, dusty scenarios (e.g., precision motors, instruments).​

Sealed Light-Duty Angular Contact Ball Bearings (Suffix 2RS): Equipped with double-sided thin nitrile rubber seals, achieving an IP54 dust and water resistance rating. Suitable for humid, low-dust scenarios (e.g., medical equipment, outdoor precision equipment), with slightly higher rotational resistance than 2Z models.​

IV. Applicable Industries and Typical Applications​

With core advantages of "lightweight, high-speed, and high-precision", LDACBB are widely used in precision industrial fields with strict transmission performance requirements. Typical applications include:​

Machine Tool Industry: CNC machine tool spindles (suitable for Model 7010AC/P4, paired DB installation, balancing radial support and axial positioning, ensuring machining accuracy of ±0.005mm at a spindle speed of 30,000 r/min), precision lathe feed shafts (suitable for Model 7003C/P5, lightweight design reducing feed resistance and improving positioning accuracy), and high-speed spindles of machining centers (suitable for Model 7015B/P4, 30° contact angle withstanding axial cutting forces to ensure high-speed cutting stability).​

Precision Motor Industry: Servo motor rotors (suitable for Model 7004AC/P4, 25° contact angle balancing radial electromagnetic forces and axial movement, with vibration ≤ 1.5m/s² at 20,000 r/min), stepping motors (suitable for Model 7001C/P5, lightweight design improving motor start-stop response speed), and micro motors for aerospace (suitable for Model 7000C with ceramic balls, Si₃N₄ ceramic balls featuring high-temperature resistance and light weight, adapting to high-altitude low-pressure environments).​

Medical Equipment Industry: CT scanner rotating frames (suitable for Model 7008B/P4, 30° contact angle withstanding axial rotational loads, noise ≤ 40dB at 15,000 r/min to avoid interfering with image precision), MRI equipment (suitable for Model 7005AC/2Z, non-magnetic material options available to avoid affecting magnetic field environments), and precision surgical instruments (suitable for Model 7002C/P2, ultra-precision ensuring the accuracy of surgical movements).​

Aerospace Industry: Small navigation equipment (suitable for Model 7003B/P2, P2 grade precision ensuring positioning error of navigation components ≤ 0.1°), UAV motors (suitable for Model 7006C with titanium alloy cages, balancing lightweight and high strength to improve battery life), and satellite attitude adjustment mechanisms (suitable for Model 7004AC with ceramic balls, withstanding extreme space temperatures and radiation to ensure long-term stable operation).​

Electronic Equipment Industry: Semiconductor wafer processing equipment (suitable for Model 7007P4, ultra-precision ensuring micron-level accuracy for wafer cutting), precision printer spindles (suitable for Model 7000C/P5, low friction ensuring smooth movement of print heads), and laser measurement instruments (suitable for Model 7001B/P4, high precision reducing vibration interference with measurement data).

V. Summary of Product Advantages
Lightweight and low energy consumption, suitable for high-speed scenarios: The weight and rotational inertia are reduced by 20%-35% compared to the ordinary models. During high-speed operation, the friction loss is small and the energy consumption is low. This not only improves the acceleration response speed of the equipment but also reduces the energy consumption during long-term operation, meeting the "high-speed and high-efficiency" requirements of precision equipment.
Composite bearing, simplifying the transmission structure: The 15°/25°/30° contact angle design enables synchronous bearing of radial and unidirectional axial loads. Paired installation can meet bidirectional axial positioning without the need for additional thrust bearings, simplifying the equipment transmission structure and reducing design and manufacturing costs.
High precision and low vibration, ensuring transmission quality: P5-P2 level accuracy covers different precision requirements. The ultra-precision treatment of raceways and balls ensures that the vibration acceleration is ≤ 2m/s² and the noise is ≤ 45dB, effectively avoiding vibration interference and ensuring the processing, measurement or operation accuracy of precision equipment.
Diverse materials, suitable for complex conditions: Various materials such as steel, ceramic composite materials, and titanium alloys are available for selection. Combined with sealing/dust-proof structures, they can adapt to complex conditions such as high temperature, humidity, dust, and low-pressure in space, with wide application ranges.
Longer lifespan, reducing operation and maintenance costs: The low friction and high precision design reduce bearing wear. In high-speed and light-load conditions, the service life is longer than that of ordinary models by more than 40%, reducing the number of equipment shutdowns and maintenance, and lowering the comprehensive operation and maintenance costs, providing a guarantee for the long-term stable operation of precision equipment.

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