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Double Row Cylindrical Roller Bearing

Double Row Cylindrical Roller Bearing

Double row cylindrical roller bearings with cage are able to withstand higher radial loads due to the linear contact between the rolling elements and the bearing ring raceways. This type of bearing can be divided into two general designs according to the position of the inner and outer ring flanges. The double row cylindrical roller bearings can be detached for easy installation and disassembly. These bearings are suitable for medium to high speed applications, but their high rigidity cannot compensate for angular deviations.

 

Your Leading Double Row Cylindrical Roller Bearing Supplier

 

SUN AUTOMATION GROUP LIMITED was founded in 1986 and had been focusing on exporting high bearing ever since. Our cylindrical roller bearing is divided into single row cylindrical roller bearing, double row cylindrical roller bearing, four row cylindrical roller bearing and eccentric roller bearing. They are used in a wide variety of applications requiring high radial load capacity and precision. We strive to be a world-class bearing provider.We strive to be a world-class bearing provider.

 

 
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Bearing designs of the double row cylindrical roller bearing
 
Bearing designs
 

Double row cylindrical roller bearings with cage are detachable and non-self-locking bearings and are available in NNU and NN designs as standard.

The NNU bearings have three integral flanges in the outer ring and no flange in the inner ring. The NN bearing has three integral flanges in the inner ring and no flange in the outer ring.

Double row cylindrical roller bearings with cage are suitable for very high radial forces and offer particularly high stiffness. Double row cylindrical roller bearings with cylindrical or tapered bore.

 

The two inner and outer rings without flanges facilitate axial displacement in the housing, and compensation for shaft misalignment or linear expansion is not limited in the bearing and does not require a sliding fit on the housing or shaft.

UKK cylindrical roller bearings are optimally designed for the contact between the rolling elements and raceways, and the logarithmic curve profile of the cylindrical rollers avoids edge stresses under high loads.

Comparison of roller profiles and stress distributions of cylindrical rollers

Comparison of roller profiles and stress distributions of cylindrical rollers: left without logarithmic curve and right with logarithmic curve 

 

Why Choose Us?
 
 
 

Rich Experience

SUN AUTOMATION GROUP LIMITED specializes in delivering professional bearing solutions, leveraging nearly 40 years of experience in bearing support and industrial services to serve its customers effectively.

 
 

Production Capacity

Our warehouse has one of the largest inventories. We have an annual output of 5 million sets of bearings. We guarantee direct shipments, timely delivery, and a single source of supply.

 
 

Production Market

Our products have been exported to North America, Europe, the Middle East, Brazil, South Africa, and Mexico and were well acknowledged by clients worldwide.

 
 

Professional Service

We have a 7*24 hours professional sales consultant team that can respond to your needs as quickly as possible and provide the fastest transportation method to bring you a high-quality and low-cost purchasing experience.

 

 

The Function of Double Row Cylindrical Roller Bearing
 

High load carrying capacity:
Because of their second row of rollers, double row cylindrical roller bearings are suitable for heavy radial loads.

 

Low friction (Roller end / flange contact area):
The open flange design, together with the roller end design and surface finish, promote lubricant film formation resulting in lower friction and higher axial load carrying capacity.

 

Long service life:
The logarithmic roller profile reduces edge stresses at the roller/raceway contact and sensitivity to misalignment and shaft deflection.

NNU4124 Cylindrical Roller Bearing

 

NN4922 Cylindrical Roller Bearing

Enhanced operational reliability:
The surface finish on the contact surfaces of the rollers and raceways supports the formation of a hydrodynamic lubricant film.

 

Separable and interchangeable:
The separable components of SKF double row cylindrical roller bearings are interchangeable. This facilitates mounting and dismounting, as well as maintenance inspections.

 

High speed capability:
The cage designs are suitable for high speeds, rapid accelerations and peak loads.

 

 

Specifications of Double Row Cylindrical Roller Bearing

 

 

Bearing name

NNU4124

Product classification

Cylindrical Roller Bearing

Bore diameter-d

120 mm

Outside diameter-D

200 mm

Width-B

80 mm

R 1.2min

2 mm

R 3.4min

2 mm

Da max

137 mm

Da max

190 mm

Ra max

2 mm

Rb max

2 mm

Basic dynamic load rating

523 KN

Basic static load rating

865 KN

Limiting Speed

3000 r/min

Weight

11 Kg

 

Application Industries of Double Row Cylindrical Roller Bearing
 

Automotive Industry

The first is automotive industry. They are commonly used in transmission systems, wheel hubs, and differentials to cater to heavy radial loads to maintain smooth movement of moving parts.

Electric Motors and Generators

These bearings enhance the longevity and efficiency of electric motors and generators by reducing friction and the generation of heat.

Industrial Gearbox

Cylindrical roller bearings are quite important to decrease friction and handle high-speed applications in different gear-driven machinery and systems.

Steel and Paper Mills

Such bearings also have applications in this industry as they can tolerate extreme loads and harsh conditions to make sure they continuously operate without hindrance.

Machine Tools

They are also used in machine tools where they offer precision and higher load carrying capabilities for rotary mechanisms and spindles.

Railway and Aerospace

You can see these bearings used in aircraft engines and train axles to provide higher speed performance and reliability in high-stress conditions.

 

Components of Double Row Cylindrical Roller Bearings
 

Inner Ring:
The inner ring, also known as the inner race or cone, is the component that attaches to the rotating shaft. It serves as the primary load-carrying surface for the bearing and directly interacts with the rollers. The inner ring's design and geometry are crucial for bearing performance, and it must be properly fitted to the shaft to ensure efficient load distribution.

 

Outer Ring:
The outer ring, often referred to as the outer race or cup, surrounds the inner ring and provides a stationary mounting surface for the bearing. It interfaces with the housing or machine structure. Just like the inner ring, the outer ring's design plays a vital role in bearing operation, and it must be securely positioned within the housing.

 

Rollers:
Rollers are the load-carrying elements of the bearing. These cylindrical, tapered, spherical, or needle-shaped components transmit the applied forces and enable smooth rotation. The design of the rollers varies depending on the bearing type and application. Cylindrical rollers are typically found in cylindrical roller bearings, while tapered rollers are used in tapered roller bearings, and so on.

 

Cage (Roller Retainer):
The cage, also known as the roller retainer or separator, is a crucial component that maintains the spacing and alignment of the rollers within the bearing. It prevents the rollers from coming into direct contact with each other, which could lead to friction and wear. Additionally, the cage aids in evenly distributing the lubricant within the bearing. The material and design of the cage can differ based on the specific bearing requirements.

 

 

Storage Temperature for Double Row Cylindrical Roller Bearing

Control and limit the relative humidity of the storage area as follows:

• 75% at 20 °C (68 °F)

• 60% at 22 °C (72 °F)

• 50% at 25 °C (77 °F)

NNU49/750 Cylindrical Roller Bearing

Ordering Process

 

 

Send Us Inquiry → Receive Our Quotation → Negotiate Details → Confirm the Sample → Sign Contract/Deposit → Mass Production →cargo Ready → Balance/Delivery → Further Cooperation

 

Payment Terms

 

 

T.T with 30% downpayment, 70%before shipment.

Paypal or West Union also accept.

 

productcate-596-286

 

Packaging and Shipping

Shipping Time: Large quantities are in stock, with shipping time as short as 2 business days.


Packaging Details: We use standard export packaging to ensure safe transportation.


Shipping method: Express, air, sea, railway. From China t0 every corner of the w0rld.

 

FAQ

 

Q: What products do you offer?

A: Precision bearing, Thin section bearing, Slewing ring bearing, Rod ends bearing, Radial shaft seal, Ball bearing, Roller bearing, Plain bearing, Cam follower & Roller follower, Linear bearing, V-Belts, Timing belt, Poly-V belt, Split bearing, Shrink discs, Adapter sleeves, Rolling mill bearing, ecy.

Q: Can I have a sample order?

A: Yes, it is available to check quality first. Mixed samples are also acceptable.

Q: How long can I expect to get the sample?

A: The samples will be ready for delivery in 1-3 days and arrive in 5-7 days.
But it is always depend on which country you are and others.

Q: When inspecting bearings, what should we need to consider?

A: The precision of the bearings (dimension tolerance, loading rate), internal clearance and hardness under heat treatment, structure of cage and material.

Q: Do you grease bearing races when installing?

A: Yes, you should grease the surfaces of bearing races during installation for proper lubrication and to prevent rust. Apply a thin coat of appropriate wheel bearing grease to the race surfaces before pressing the race into the hub and before installing the bearing cone into the greased race.

We're well-known as one of the leading double row cylindrical roller bearing manufacturers and suppliers in China. If you're going to buy high quality double row cylindrical roller bearing with competitive price, welcome to get more information from our factory.

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