315976 B
Cylindrical Roller Bearings Double Row, With Cage feature a double-row cylindrical roller design that delivers higher radial load capacity and increased system rigidity within a compact installation space. The cage structure accurately guides and evenly spaces the rollers, reducing friction and roller slippage, and ensuring stable performance under high-speed and heavy-load conditions.
Building on these structural advantages, JRZC double row cylindrical roller bearings are manufactured from high-purity bearing steel and incorporate optimized roller profiles and raceway geometry to significantly enhance load capacity and fatigue life. Through precision heat treatment and strict dimensional tolerance control, the bearings achieve low vibration, low noise, and low operating temperature. In addition, we offer customizable cage materials, internal clearances, and accuracy classes, allowing flexible adaptation to different operating conditions and making them a reliable choice for electric motors, gearboxes, machine tool spindles, and heavy industrial equipment.
- Dimensions
Bore diameter 280 mm Outside diameter 470 mm Width 200 mm PerformanceBasic dynamic load rating 2 700 kN Basic static load rating 5 100 kN Grease Reference speed 500 r/min Oil Limiting speed 750 r/min - Properties
Bore type Cylindrical For Load Direction Radial Number of rows double row Radial internal clearance C3 Tolerance class for dimensions Nomal Tolerance class for run-out P6 Seal type Without Lubricant None Relubrication feature Without - Weight and Material
Product net weight 146 kg Roller material Chrome steel Ring Material Chrome steel Cage BRASS
1. Need for High Radial Load Capacity in Limited Space
Customer Pain Point: Machinery requires high load-carrying capability but has limited space for bearing installation. Single-row bearings cannot provide sufficient radial load capacity without increasing bearing size.
Solution: JRZC double row cylindrical roller bearings feature two rows of rollers, significantly increasing radial load capacity without expanding the bearing's footprint . The linear contact between rollers and raceways ensures optimal load distribution across a wider contact area, reducing localized stress and extending service life .
2. Insufficient Rigidity Leading to Shaft Deflection
Customer Pain Point: Equipment experiences shaft deflection or deformation under heavy loads, compromising machining accuracy and operational stability.
Solution: The double row configuration provides exceptional rigidity, ensuring precise shaft positioning and minimal deflection even under constant heavy stress . This makes JRZC bearings ideal for machine tool spindles, gearboxes, and precision industrial drives where dimensional stability is critical .
3. Difficulty in Installation and Maintenance
Customer Pain Point: Bearing installation and replacement are time-consuming, requiring specialized tools or heating processes, leading to extended equipment downtime.
Solution: JRZC double row cylindrical roller bearings feature a separable design—inner and outer rings can be disassembled independently . This simplifies assembly, facilitates maintenance, and allows faster replacement during equipment servicing, reducing downtime and labor costs .
4. Heat Generation and Friction at Medium to High Speeds
Customer Pain Point: Bearings overheat or experience excessive friction when operating at medium to high speeds, leading to premature failure and lubricant degradation.
Solution: The cage design ensures stable roller spacing, reduces frictional heat, and improves lubrication distribution within the bearing . The cage prevents roller-to-roller contact, minimizes friction, and enables efficient lubricant flow, allowing the bearing to maintain consistent rotational accuracy at medium to high speeds .
5. Roller Skewing and Misalignment During Operation
Customer Pain Point: Rollers become misaligned or skewed during operation, causing uneven load distribution, increased wear, and potential bearing seizure.
Solution: The precision-engineered cage maintains uniform roller spacing and ensures continuous alignment, preventing roller jamming or skewing during acceleration and operation . This is particularly critical in high-speed applications where dynamic forces are present.
