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Double row Cylindrical Roller Bearing

Double-row cylindrical roller bearing is a type of rolling bearing with two rows of cylindrical rollers, widely used in industrial equipment requiring high rigidity and load carrying capacity. The main structure includes an inner ring, an outer ring, two columns of cylindrical rollers and a cage. Due to the double-row design, the roller is in linear contact with the raceway, which can withstand greater radial loads while providing higher rigidity and stability. Double-row cylindrical roller bearings are suitable for high-precision and high-speed operation conditions, and are often used in machine tool spindles, rolling mills, heavy machinery and other fields. Although it mainly bears radial loads, it can also bear certain axial loads. Regular lubrication and maintenance can extend its service life and ensure reliable operation of the equipment.

Standard

GB,ASTM/AISI,ГОСТ,BS,JIS,NF,DIN / VDEh

Material

52100、100Cr6、SUJ2

Inner diameter (d)

25-440mm

Outer diameter (D)

40-1100mm

Mass

0.1-600kg

Brand

QIBR/OEM/Neutral

Package

QIBR/Standard Industrial Package/OEM

Applications

Spinspindle of large motors,Machine tool spindle

QIBR Model Selection

Filters

Inner diameter (d)

Outer diameter (D)

Radial dynamic load

Static load rating,radial

Weight

Width (B)

NO.	Product Number	Inner diameter (d)	Outer diameter (D)	Radial dynamic load	Static load rating,radial	Weight	Width (B)
401	NN30/530K	530 mm	780 mm	3200 KN	6900 KN	280 kg	185 mm
402	NN30/530	530 mm	780 mm	3200 KN	6900 KN	280 kg	185 mm
403	NN49/560K	560 mm	750 mm	3250 KN	8700 KN	218 kg	190 mm
404	NN49/560	560 mm	750 mm	3250 KN	8700 KN	218 kg	190 mm
405	NNU49/560K	560 mm	750 mm	3250 KN	8700 KN	230 kg	190 mm
406	NNU49/560	560 mm	750 mm	3250 KN	8700 KN	230 kg	190 mm
407	NN49/600K	600 mm	800 mm	3850 KN	10500 KN	273 kg	200 mm
408	NN49/600	600 mm	800 mm	3850 KN	10500 KN	273 kg	200 mm
409	NNU49/600K	600 mm	800 mm	3850 KN	10500 KN	284 kg	200 mm
410	NNU49/600	600 mm	800 mm	3850 KN	10500 KN	284 kg	200 mm
411	NN49/630K	630 mm	850 mm	4200 KN	11400 KN	328 kg	218 mm
412	NN49/630	630 mm	850 mm	4200 KN	11400 KN	328 kg	218 mm
413	NNU49/630K	630 mm	850 mm	4200 KN	11400 KN	328 kg	218 mm
414	NNU49/630	630 mm	850 mm	4200 KN	11400 KN	328 kg	218 mm
415	NN49/670K	670 mm	900 mm	4150 KN	11500 KN	419 kg	230 mm
416	NN49/670	670 mm	900 mm	4150 KN	11500 KN	419 kg	230 mm
417	NNU49/670K	670 mm	900 mm	4150 KN	11500 KN	381 kg	230 mm
418	NNU49/670	670 mm	900 mm	4150 KN	11500 KN	381 kg	230 mm
419	NNU49/710BK	710 mm	950 mm	4450 KN	12600 KN	472 kg	243 mm
420	NNU49/710B	710 mm	950 mm	4450 KN	12600 KN	472 kg	243 mm
421	NNU49/750K	750 mm	1000 mm	5500 KN	15900 KN	530 kg	250 mm
422	NNU49/750	750 mm	1000 mm	5500 KN	15900 KN	530 kg	250 mm
423	NNU49/800K	800 mm	1060 mm	5700 KN	16500 KN	573 kg	258 mm
424	NNU49/800	800 mm	1060 mm	5700 kN	16500 kN	573 kg	258 mm

The double row cylindrical roller bearings have addressed several key issues across various fields, primarily reflected in the following aspects:

1. High rigidity

Due to the double row roller design, these bearings offer higher rigidity compared to single row bearings, effectively reducing vibration and improving equipment stability.

2. Adaptability to high-speed operation:

While primarily designed to handle heavy loads, the precision manufacturing process allows these bearings to support high-speed operation while maintaining smooth performance.

3. Effective noise control

High-precision double row cylindrical roller bearings, through precise installation, proper lubrication, and advanced monitoring systems, can effectively reduce operational noise and enhance overall equipment performance.

4. High cost-effectiveness

The design of double row precision cylindrical roller bearings allows for efficient load support in relatively compact spaces. Their use can reduce costs while improving rigidity and stability.

Performance enhancements and solutions for double row cylindrical roller bearings

1. Dustproof and waterproof design

Especially in harsh environments, bearings require sufficient protection to prevent dust, mud, and other contaminants from entering the bearing interior. Sealing designs can achieve this, thereby avoiding impacts on bearing performance and lifespan.

2. Roller optimization

Optimizing roller shapes can reduce contact stress, improve load capacity, and enhance durability. Surface treatments on rollers can reduce friction, improve rolling precision and load capacity, and extend bearing life.

3. Improved manufacturing precision

Using advanced foreign processing equipment and techniques, such as precision grinding and superfinishing, enhances the geometric accuracy of inner and outer rings and rollers, reducing machining errors and improving rotational precision and surface finish.

4. Enhanced material performance

Surface coating technologies can improve wear resistance and corrosion resistance, effectively extending bearing life, especially in harsh working environments where bearing performance can be significantly enhanced.

Main application fields of double row cylindrical roller bearing

1. Machine tools

In high-precision machine tools, double row precision cylindrical roller bearings are used to withstand heavy loads, ensuring machining accuracy and stability.

2. Locomotive axle boxes

These bearings are widely used in railway locomotive axle boxes. Their design can withstand high loads and effectively prevent the ingress of dust and moisture, improving reliability and service life.

3. Robotics

In industrial and service robots, precision cylindrical roller bearings ensure precise motion and high efficiency.

4. High-precision instruments:

In precision measuring instruments and optical equipment, these bearings support rotating components, ensuring instrument accuracy and stability.