Product Description

Name Current-Insulating Bearings
Brand MONTON
Model 558320C.J20A
d 100mm
D mm
D mm
Ring Material Gcr15/Special materail
Cage Material Brass cage
Load rating  dynamic KN
Load rating  static KN
Fatigue Limit Load Pu[kN]  
Reference speed [r/min]  
Limiting speed [r/min]  
Sealed as customer requested
Weight 9.25KG
Design Structure Roller
Precision P5/P6 or as customer requested
Vibration ZV1, ZV2, ZV3, or  as customer requested
Clearance C0, C2, C3, or  as customer requested
Quality standard ISO9001: 2000/SGS
Package single box
Original HangZhou
Service OEM
Delivery date Accordingly
Application Threephase motor,Traction motor,Wind power generator

Insulated Insocoat bearings

Electric motors, generators and associated equipment are at risk when an electric current passes through their bearings. This can damage the contact surfaces of rolling elements and raceways in the bearings (electrical erosion) and rapidly degrade the grease. An additional risk in electric motors and generators comes from high frequency currents caused by the inherent stray capacitance. 

The risk of damage increases where the application uses a frequency converter.

Insulated Insocoat bearings are designed to prevent electric current from passing through the bearing have the external surfaces of either their inner or outer ring coated with an insulating aluminium oxide layer, by applying a sophisticated plasma-spray process for an outstanding quality finish  are a very cost-effective solution compared with other insulation methods.

Electrical pitting often occurs in the use of rolling bearings in high power electromotor, wind turbine generator and rail vehicles motor systems and cause sparks that damage the rolling contact surface, ultimately lead to bearing failure.

Electric insulated bearings therefore have been created and take the place of non-insulated bearings. we  applies advanced surface modification process overlay a ceramic coating on the bearing ring, to insulate the electrical current flow into bearing substrate, so the electrical pitting is prevented and bearing’s service life is extended.

It is significantly more cost-effective to provide for the use of electrically insulated bearings at the plHangZhou stage. As a result, customer benefit is increased through reduced maintenance costs and higher machine availability.

SAT series are the electrically insolated bearing products developed and marketed by us The insulation has a guaranteed breakdown resistance of at least 1000V AC or DC. We can also develop tailored modes for customer on types and precision levels, as well as higher electrical insulation.

Bearing features

Protection against electrical erosion 

With insulating properties integrated into the bearing, INSOCOAT bearings can improve reliability and increase machine uptime by virtually eliminating the problem of electrical erosion.

High electrical resistance 

The aluminium oxide coating provides a minimum electrical resistance of 200 Ω and can withstand voltages up to 3 000 V DC.

Consistent electrical performance 

Plasma-spray coatings are normally hygroscopic and, therefore, vulnerable to penetration caused by condensation. To protect against this effect, INSOCOAT bearings are treated with a unique sealant.

Application of Insulated Bearings in Electric motors

1. Causes and harm of motor shaft voltage and bearing current formation

In the operation of the motor, any imbalance in the phase currents in or around the rotor’s magnetic circuit can  produce a rotating system flux linkage.

When the shaft rotates, these flux chains can generate a potential difference across the shaft. This potential difference is called the shaft voltage. The shaft voltage can excite a circulating current through a loop formed by the 2 ends of the bearing in the shaft and the casing (closed circuit), which is called the shaft current.

In addition, the rotor core has more remanence, For a wound rotor motor, shaft voltage and shaft current are generated if 2 or more windings are short-circuited to the rotor core or the shaft. the bearing current is related to the structure of the motor, the power of the motor, the magnitude of the drive voltage, the rise time of the pulse, the length of the cable, etc. The larger the power of the motor, the higher the driving voltage, the steeper the rising edge of the driving voltage, and the shorter the cable, the larger the bearing current.

2. How to block shaft current – use electrically insulated bearings

In order to avoid damage to the bearing caused by the shaft current, effective measures should be taken to isolate the shaft current. For large motors with independent bearing housings at both ends, spacers made of insulating material can be placed between the bearing housing and the metal base. For a motor in which an ordinary bearing and a casing are integrated, an Electrically insulated bearing is generally used at 1 end thereof (often arranged at the non-spindle end).

For high requirements, insulated bearings are installed at both ends. The insulating bearing used is generally a method of attaching (generally coating) an insulating layer to the outer ring. In some cases, the inner and outer rings are also provided with an insulating layer.

Electrically insulated bearings avoid damage caused by electrical corrosion, so they are more reliable in operation than in conventional bearings. And compared to other insulation methods, such as shaft or housing insulation, etc. More cost effective and reliable. Insulated bearings have the same dimensions and basic technical features as non-insulated bearings Suitable for motors, generators, especially variable frequency motors.

CoatMaster (China Bearing manufacturer), As the exprienced Electrically Insulated Bearing manufacturer of China, Not only produce insulated deep groove ball bearing, insulated cylindrical roller bearing, insulated tapered roller bearing, insulated angular contact ball bearing and the other type of insulated bearing, but also supply complete and expert solution for electric motor and the other applications where need insulated bearing. if you have problem make you distracted about the insulated bearing, just contact with our bearing technical team.

Designation Principal dimensions Basic load ratings Fatique load limit Speed ratings Mass
dynamic static Reference speed Limiting speed
d D B C C0 Pu
mm mm mm kN kN kN r/min   kg
NU1571ECP/C3VL5711 50 80 16 47,3 57 7,2 9 500 9 500 0,27
NU210ECM/C3VL5711 50 90 20 66 72 9,15 7 500 9 000 0,48
NU310ECM/C3VL5711 50 110 27 112 116 15,3 6 000 8 000 1,35
NU1011ECP/C3VL5711 55 90 18 57,2 69,5 9 8 500 13 000 0,4
NU1011ECML/C3VL5711 55 90 18 57,2 69,5 9 8 500 13 000 0,45
NU211ECM/C3VL5711 55 100 21 85,8 100 12,9 7 000 8 000 0,78
NU311ECM/C3VL5711 55 120 29 138 146 19 5 600 7 000 1,75
NU1012ML/C3VL5711 60 95 18 38 45,5 5,85 8 000 13 000 0,48
NU1012ECP/C3VL5711 60 95 18 58,3 73,5 8,8 8 000 8 000 0,48
NU212ECM/C3VL5711 60 110 22 96,8 106 14 6 300 7 500 0,97
NU312ECM/C3VL5711 60 130 31 151 160 20,4 5 000 6 700 2,15
NU1013ECP/C3VL5711 65 100 18 62,7 81,5 10,6 7 500 7 500 0,45
NU213ECM/C3VL5711 65 120 23 110 122 16 5 600 6 700 1,25
NU313ECM/C3VL5711 65 140 33 183 196 25,5 4 800 6 000 2,65
NU1014ECM/C3VL5711 70 110 20 70,4 85 10,8 7 000 7 000 0,69
NU1014ECP/C3VL5711 70 110 20 76,5 93 12 7 000 7 000 0,62
NU214ECM/C3VL5711 70 125 24 121 140 18,6 5 300 6 300 1,35
NU314ECM/C3VL5711 70 150 35 209 228 29 4 300 5 600 3,1
NU1015M/C3VL5711 75 115 20 58,3 71 9,3 6 700 6 700 0,75
NU215ECM/C3VL5711 75 130 25 132 160 21,2 5 300 6 000 1,5
NU315ECM/C3VL5711 75 160 37 242 270 34 4 000 5 300 3,9
NU315ECP/VL5711 75 160 37 242 270 34 4 000 5 300 3,9
NU1016ECM/C3VL5711 80 125 22 99 127 16,3 6 000 6 000 1,05
NU216ECM/C3VL5711 80 140 26 142 173 22 4 800 5 600 1,85
NU316ECM/C3VL5711 80 170 39 264 290 36 3 800 5 000 4,6
NU1017M/C3VL5711 85 130 22 72,1 91,5 11,6 6 000 6 000 1,1
NU217ECM/C3VL5711 85 150 28 168 200 25,5 4 500 5 300 2,25
NU317ECM/C3VL5711 85 180 41 297 340 41,5 3 600 4 800 5,3
NU1018M/C3VL5711 90 140 24 85,8 110 13,7 5 600 5 600 1,35
NU218ECM/C3VL5711 90 160 30 187 224 28 4 300 5 000 2,75
NU318ECM/C3VL5711 90 190 43 319 360 44 3 400 4 500 6,25
NU1019ML/C3VL5711 95 145 24 88 116 14,3 5 300 5 300 1,4
NU219ECM/C3VL5711 95 170 32 224 270 33,5 4 000 4 800 2,85
NU319ECM/C3VL5711 95 200 45 341 390 46,5 3 200 4 300 7,25
NU1571M/C3VL5711 100 150 24 89,7 122 15 5 000 5 000 1,45
NU220ECM/C3VL5711 100 180 34 251 310 38 3 800 4 500 4
NU320ECM/C3VL5711 100 215 47 391 440 51 3 000 3 800 8,65
NU1571M/C3VL5711 110 170 28 130 173 20,8 4 500 4 500 2,3
NU222ECM/C3VL5711 110 200 38 297 375 44 3 400 4 000 5,6
NU322ECM/C3VL5711 110 240 50 468 540 61 2 600 3 400 12
NU1571M/C3VL2071 120 180 28 138 190 22,4 4 000 4 000 2,55
NU224ECM/C3VL5711 120 215 40 341 440 50 3 000 3 600 6,65
NU324ECM/C3VL5711 120 260 55 539 620 69,5 2 400 3 200 15
NU1026M/C3VL2071 130 200 33 168 232 27 3 800 5 600 3,85
NU226ECM/C3VL2071 130 230 40 369 465 52 2 800 3 400 7,6
NU326ECM/C3VL2071 130 280 58 627 750 81,5 2 200 3 000 18,5
NU1571M/C3VL2071 140 210 33 179 255 29 3 600 3 600 4,05
NU228ECM/C3VL2071 140 250 42 396 520 58,5 2 600 3 200 9
NU328ECM/C3VL2071 140 300 62 682 830 88 2 200 2 800 25
NU1030M/C3VL2071 150 225 35 194 275 18 3 200 3 200 4,9
NU230ECM/C3VL2071 150 270 45 457 610 65,5 2 400 2 800 12
NU330ECM/C3VL2071 150 320 65 765 950 100 2 000 2 600 31

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Aligning: Non-Aligning Bearing
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tapered roller bearing

Can you Explain the Concept of Bearing Clearance in Tapered Roller Bearings?

Bearing clearance, also known as internal clearance, refers to the space or gap between the various components of a tapered roller bearing when it is not under load. This clearance exists to accommodate the thermal expansion of the bearing components, ensure proper lubrication, and prevent excessive interference during operation. Here’s how bearing clearance works in tapered roller bearings:

  • Thermal Expansion:

As tapered roller bearings operate, they generate heat due to friction and loading. This heat causes the bearing components, including the inner and outer rings, rollers, and cage, to expand. Bearing clearance provides the necessary space for these components to expand without causing binding or excessive load on the rolling elements.

  • Lubrication Film:

The lubricant within the bearing forms a thin film between the rolling elements and raceways. Bearing clearance ensures that the rolling elements can move smoothly within this lubrication film, reducing friction and wear.

  • Operating Conditions:

Bearing clearance affects the behavior of the bearing under different operating conditions. Excessive clearance can lead to vibration, noise, and reduced load-carrying capacity, while insufficient clearance may result in increased friction, heat generation, and premature failure.

  • Types of Clearance:

Tapered roller bearings can have various types of clearance, including radial clearance (between the rollers and raceways) and axial clearance (along the bearing axis). The choice of clearance depends on the application’s requirements and the desired balance between load capacity and internal stress.

  • Preload vs. Clearance:

Preload, which is the application of a controlled axial force, eliminates internal clearance and optimizes the distribution of load between rolling elements. In contrast, bearing clearance provides the necessary space for thermal expansion and lubrication, albeit at the cost of increased play.

  • Application-Specific Considerations:

The optimal bearing clearance varies depending on factors such as the application’s operating temperature, speed, and load magnitude. Engineers carefully select the appropriate clearance to ensure optimal bearing performance.

  • Measuring Clearance:

Bearing clearance can be measured using specialized instruments or techniques that assess the gap between components when the bearing is not under load.

Proper bearing clearance is crucial to maintaining optimal performance, minimizing wear, and preventing premature failure in tapered roller bearings. It is a critical factor that engineers consider when selecting and designing bearings for specific applications.

cylindrical roller bearing

Are there different cage materials commonly used in cylindrical roller bearings?

Yes, there are different cage materials commonly used in cylindrical roller bearings. The cage, also known as a retainer or separator, is a critical component that holds the cylindrical rollers in position and maintains their proper spacing. The choice of cage material depends on various factors such as application requirements, operating conditions, and the desired balance between strength, durability, and cost. Let’s explore some of the commonly used cage materials in cylindrical roller bearings:

  • Steel:

Steel cages are widely used in cylindrical roller bearings due to their excellent strength, durability, and wear resistance. Steel cages can withstand high operating temperatures and are suitable for applications with heavy loads and high-speed operation. The steel cages are typically made from low carbon steel, and in some cases, high-strength brass-coated steel or other alloyed steels are used for enhanced performance in demanding environments.

  • Brass:

Brass cages offer good strength, high corrosion resistance, and excellent heat dissipation properties. They are commonly used in cylindrical roller bearings for applications that require resistance to harsh operating conditions, such as high temperatures or corrosive environments. Brass cages are particularly suitable for slow to moderate speed applications where their excellent thermal conductivity can help dissipate heat effectively.

  • Polyamide (Nylon):

Polyamide cages, often referred to as nylon cages, are lightweight, corrosion-resistant, and have good wear properties. They offer low friction and allow for smooth rolling motion of the cylindrical rollers. Polyamide cages are commonly used in applications where reducing weight and inertia are important considerations, such as automotive and aerospace industries. They are also suitable for applications with moderate speeds and operating temperatures.

  • Phenolic Resin:

Phenolic resin cages are known for their high strength, low friction, and excellent dimensional stability. These cages provide good resistance to wear, chemicals, and heat. Phenolic resin cages are commonly used in high-speed cylindrical roller bearings where low cage weight and inertia are crucial for reducing friction and maintaining stable operation at high rotational speeds.

  • Other Materials:

In addition to the above-mentioned materials, other cage materials such as aluminum alloys, stainless steel, and engineered plastics may be used in specific applications. Aluminum alloy cages offer lightweight properties and good corrosion resistance, making them suitable for certain industries. Stainless steel cages provide high corrosion resistance and are used when the bearing operates in aggressive environments. Engineered plastics, such as PEEK (polyether ether ketone) or PTFE (polytetrafluoroethylene), are used for their self-lubricating properties, chemical resistance, and low friction characteristics.

The choice of cage material depends on factors such as load, speed, temperature, lubrication, and environmental conditions. Bearing manufacturers carefully select the appropriate cage material to ensure optimal performance, longevity, and reliability of the cylindrical roller bearing in a specific application.

cylindrical roller bearing

How do cylindrical roller bearings contribute to reduced friction and heat generation?

Cylindrical roller bearings play a crucial role in reducing friction and minimizing heat generation in various applications. Let’s explore how these bearings contribute to these important factors:

  • Rolling Motion:

Cylindrical roller bearings facilitate rolling motion between the inner and outer rings, as well as the cylindrical rollers. This rolling motion significantly reduces friction compared to sliding or rubbing contact. Instead of sliding against each other, the rolling elements roll smoothly over the raceways, resulting in lower frictional forces. The reduced friction helps to minimize energy loss and heat generation within the bearing.

  • Precision Manufacturing:

Cylindrical roller bearings are precision-engineered components manufactured to tight tolerances. The surfaces of the rollers and raceways are carefully finished to ensure smooth and precise contact. The high precision in the bearing’s construction minimizes irregularities and imperfections that could cause increased friction and heat generation. By maintaining close tolerances, cylindrical roller bearings optimize performance and reduce frictional losses.

  • Lubrication:

Proper lubrication is essential for reducing friction and heat in cylindrical roller bearings. Lubricants create a thin film between the rolling elements and raceways, separating them and minimizing direct metal-to-metal contact. This lubricant film acts as a protective barrier, reducing friction and dissipating heat generated during operation. Adequate lubrication also helps to prevent wear, corrosion, and premature failure of the bearing.

  • Cage Design:

Cylindrical roller bearings often incorporate a cage or separator that spaces and guides the rollers. The cage retains the individual rollers in their proper positions, preventing them from contacting and rubbing against each other. This design feature not only maintains the integrity of the rolling elements but also reduces friction and heat generation by minimizing contact between adjacent rollers. The cage also helps to maintain proper lubricant distribution throughout the bearing.

  • Efficient Load Distribution:

Cylindrical roller bearings have a line contact between the rollers and raceways, which enables efficient load distribution. The cylindrical shape of the rollers allows them to bear loads along their length, spreading the load over a larger surface area compared to other bearing types. This even distribution of the load reduces localized stresses and friction at specific contact points, resulting in reduced heat generation.

  • Heat Dissipation:

Cylindrical roller bearings are typically designed with features that facilitate heat dissipation. They may incorporate special heat-treated components, such as rings and rollers, that have enhanced heat resistance properties. Additionally, the bearing design may include features such as grooves, holes, or special surface coatings to improve heat dissipation and prevent the buildup of excessive temperatures within the bearing assembly.

By minimizing friction and heat generation, cylindrical roller bearings contribute to improved efficiency, reduced energy consumption, and extended bearing life. These factors are crucial in various applications where the performance, reliability, and longevity of rotating machinery are critical considerations.

China wholesaler 558320c. J20A Insulated Cylindrical Roller Railway Locomotive Bearing   with high qualityChina wholesaler 558320c. J20A Insulated Cylindrical Roller Railway Locomotive Bearing   with high quality
editor by CX 2024-04-03