Needle Roller and Cage Assembly NA3065 NADELLA

The NADELLA NA3065 is a high-performance needle roller bearing, characterized by its compact structure, high load-carrying capacity and excellent wear resistance, specifically designed for heavy-load, limited-installation-space industrial applications. It fully complies with ISO and DIN bearing industry standards, integrating premium materials, advanced manufacturing processes and optimized structural design. The following is a comprehensive and concise technical overview.

1. Detailed Dimensional Parameters: Conforming to DIN 6341 and ISO standards, the bearing has an inner diameter (d) of 65mm, outer diameter (D) of 105mm, and width (B) of 38mm. The chamfer size (r) is 1.2mm (minimum limit), and the single weight is 1.31 kg. Its tolerance grade is IT6 for inner/outer diameter and IT7 for width. The basic dynamic load rating is 112kN, basic static load rating is 145kN, reference speed (grease lubrication) is 6800r/min, and limiting speed (oil lubrication) is 9500r/min. It adopts a cylindrical bore with a smooth surface (Ra ≤ 0.2μm) for precise fitting, ensuring stable load transmission.

2. Specific Material Description: Inner ring, outer ring and needle rollers are made of high-carbon chromium bearing steel (AISI 52100/SUJ2), refined by vacuum degassing technology to reduce harmful impurities and improve material uniformity. After precision heat treatment, it reaches a hardness of 61-65 HRC, featuring excellent wear resistance, high fatigue strength and good dimensional stability under long-term operation. The retainer is made of high-strength polyamide (PA66), which has good impact resistance, self-lubricating performance and lightweight, ensuring stable operation at high speeds and reducing friction noise. For special corrosion-resistant requirements, optional stainless steel (SUS440C) components are available.

3. Core Processing Technology: Key processes include precision forging, CNC turning, controlled atmosphere heat treatment, precision grinding and superfinishing. Precision forging ensures dense internal structure and uniform metal fiber distribution, enhancing overall bearing strength; CNC turning achieves Ra ≤ 0.3μm surface roughness, ensuring dimensional accuracy. Heat treatment adopts nitrogen-hydrogen protective atmosphere to avoid oxidation and decarburization, ensuring uniform hardness distribution. Precision grinding with CBN砂轮 and superfinishing reduce raceway roughness to Ra ≤ 0.04μm, minimizing friction and extending service life.

4. Service Life: Under standard working conditions (2800r/min, radial load 40kN, proper lubrication and clean environment), the L₁₀ basic rated life (90% reliability) is 22,000 operating hours, calculated in accordance with ISO 281 standard. Key influencing factors include lubrication quality, pollution level, installation accuracy and load magnitude; insufficient lubrication or excessive contamination can reduce service life by 40-60%, while improper installation may cause premature wear.

5. Application Scenarios and Industries: Widely used in mechanical manufacturing, automotive, engineering machinery and textile industries. Typical applications include gearboxes, crankshafts, connecting rods, hydraulic cylinders and precision machine tool components. It is particularly suitable for scenarios with limited installation space and heavy radial loads, such as machine tool slides, agricultural machinery transmissions and industrial robot joints, due to its compact structure, high load-carrying capacity and excellent wear resistance.

6. Basic Maintenance Requirements: Maintenance cycle is 1800 operating hours. Lubrication: Lithium-based grease (NLGI 2) or extreme pressure gear oil (ISO VG 68), filling amount 10-25% of bearing free space; re-lubricate every 1200-1800 hours. Cleaning: Clean surface with clean kerosene to remove dust and old grease, avoid using corrosive cleaners, and dry thoroughly after cleaning. Regular inspection: Check for abnormal noise, temperature rise and grease leakage; replace lubricant immediately if it deteriorates, and inspect bearing wear status if abnormal vibration occurs.

7. Installation Precautions: Pre-installation: Keep the installation area clean, remove burrs from shaft and bearing seat, check fitting surface roughness (Ra ≤ 0.8μm) and dimensional accuracy. Installation: Apply a thin oil film on fitting surfaces, use a press to apply force evenly on the inner ring (avoid tapping to prevent damage), ensure coaxiality tolerance ≤ 0.015mm. Fastening torque: 100-130N·m for bearing seat bolts, tighten evenly in diagonal order. Post-installation: Rotate manually to check for jamming or tightness; measure temperature after 30 minutes of operation (normal operating temperature ≤ 68℃). Safety: Wear protective gloves and goggles during operation, take anti-static measures, and avoid direct contact with sharp edges to prevent injury.