Double Row Full Complement Cylindrical Roller Bearing For Planetary Gears

Planetary gears are utilized in gearboxes to power anything from basic plant machinery to cutting-edge electric vehicles and are at the core of contemporary engineering. Thousands of years ago, the straightforward design of a central drive and orbiting gears was created to simulate the motions of the planets. What is a planetary gearbox? An instrument having aligned input and output shafts is a planetary gearbox. The most efficient way to transmit the most torque is through a planetary gearbox.  In addition to being compact, planetary gearing also has an in-line shafting and a cylindrical assembly. Three different types of gear make up a planetary gear set: 
  • Sun gear, 
  • Planet gear, and 
  • Ring gear. 
The planet gears are usually installed on a movable carrier, and the sun gear in the middle transmits torque to them. The sun gear is orbited by the planet gears, which mesh with the outer ring gear. Depending on the application, planetary gear systems can range in complexity from extremely simple to complicated compound systems.

Where Can You Find Planetary Gears?

Planetary gears are typically used in applications where space is confined because they are smaller than other types of gearboxes. They are also the foundation of the hydraulic planetary automatic transmission, which is the most common type of automatic transmission. Applications:
  • Wheel drives
  • Track drives
  • Conveyors
  • Pumps
  • Drilling drives
  • Cutter head drives

Why are planetary gears used?

Planetary gearing is used in challenging applications because the three planet gears are evenly distributed around the sun. They are more durable and power dense, allowing them to handle higher torques and reductions in a smaller, more compact package. Because of Planetgear’s unique self-aligning properties, they can also withstand higher shock loads and overhung loads. Double Row Full Complement Cylindrical Roller Bearing for Planetary gears Full complement cylindrical roller bearings with no outer ring are commonly used in planetary reducer gears. Reducers are essential devices used by a variety of machinery and equipment. To rotate and achieve long life, the bearings must meet the requirements of high speed and stability under various working conditions. Full complement cylindrical roller bearings without an outer ring, which use the inner hole of the gear as the outer ring and outer raceway of the bearing to simplify the host design and save space. The complete roller design can achieve the maximum rated load in a small area, and the average increase in effective load should be between 15% and 20%.
Full complement two-row CRB designs are different because:
  • No cages to hold rollers
  • No outer race
  • Maximum number of rollers vis-a-vis any CRB
  • Non-separable
Advantages of planetary gears
  1. High efficiency
  2. Compact construction
  3. High power density
  4. Easy to fit
  5. Long life
Planetary gears are distinguished by their high efficiency; they also have a high power density compared to other gear types due to their compact design. Using an external ring gear, in particular, reduces the volume and mass of this type of gear. It also allows high torque transmission in a small construction space by utilizing multiple parallel tooth combinations with multiple orbiting wheels. Because the torque is spread across several gear wheels, the tooth forces are lower than in other types of gear. Furthermore, no synchronization is required, which means that gear changes can be made without disrupting the traction. The planetary gear operates at high speeds because all gear wheels are constantly meshing with one another.

Configuration of cylindrical roller bearings

Double row full complement cylindrical roller bearings are non-latching and dismountable bearings that are classified as NNC, NNCL, NNCF, and ACB. Cylindrical Roller bearings have three integral flanges on the inner ring, one integral flange, and a loose shoulder ring on the outer ring. They can absorb axial forces from both directions and can therefore be utilized as fixed bearings. The requirement for the absorption of axial forces in both directions is the support of the loose shoulder ring through structural design. Cylindrical roller bearings with a double-row full complement absorb the most significant radial forces and have exceptionally high radial stiffness. NBC manufactures standard and special bearing products for all industrial applications.

Industrial Applications of Bearings – A Comprehensive Guide

Do you know what “bearings,” a mechanical component, actually do? They are so essential to the machine sector that they have been dubbed the sector’s “bread and butter.” They are employed in a wide variety of machines. Still, because they operate in secrecy, most individuals not engaged in the machine sector probably have no idea what they mean when they hear the name. Bearings come in a wide range of shapes and sizes and are an essential tribological part of many different types of machinery. In a system that may be under static or dynamic loading, they can be described as a machine element that supports/permits only a particular form of motion (limitation of degrees of freedom).

What are bearings?

Bearings are “components that aid in the rotation of objects.” Inside the equipment, they support the shaft that revolves. Automobiles, aircraft, power generators, and other devices need bearings. Even common household items like refrigerators, vacuum cleaners, and air conditioners we use daily contain them. The rotating shafts of the wheels, gears, turbines, rotors, etc., in those devices, are supported by bearings, enabling smoother rotation. Although bearings in industrial applications may appear straightforward mechanical components initially, they are essential to our survival.

Purpose of bearings

Bearings primarily avoid direct metal-to-metal contact between two elements in relative motion. By doing this, friction, heat production, and, ultimately, part wear and tear are avoided. As low-friction rolling takes the place of sliding motion, it also lowers energy consumption. Additionally, they transfer the rotating element’s load to the housing. This load could be either radial, axial, or both. A bearing, as previously mentioned, limits the freedom of motion of moving parts in specific directions.

Different types of bearings

There are various types of bearings, each used for a particular function and designed to support a specific type of load, like ball bearings,  Ball bearings A ball bearing is a specific kind of rolling-element bearing that uses balls to keep the bearings’ inner and outer moving components apart. A ball bearing’s main functions are to support radial and axial loads and lessen rotational friction. Ball bearings in industrial applications have a straightforward design, are reliable, and are simple to maintain. They come in open and sealed varieties and single and multiple-row styles. They are appropriate for high speeds since they have low frictional torque. Ball bearings connect the shaft to the motor housing, for instance, in electrical motors when the shaft is free to rotate but the motor housing is not. They are further divided into
  • Deep groove ball bearings
  • Angular contact ball bearings
  • Thrust ball bearings
  • Self-aligning ball bearings
Applications of the ball bearings:
Household items: Bicycles, Washing machines, Hair dryers, Fishing rods, DVD players, and Food processors. Office equipment: Fax machines, hard drives, fans, etc.  Industries: Elevators, assembly lines, Chain saws, power pumps, toy manufacturing, etc. Automotives: Engines, steerings, electric motors, gearboxes, etc.
Advantages of ball bearings:
  • Do not require much lubrication.
  • Long service life.
  • Low price.
  • Can handle thrust hold.
  •  Good wear resistance.
  • Can break easily due to shock
  • Can be loud
  • Fail to handle heavyweight
Cylinder roller bearing The outer ring, inner ring, and cylindrical roller bearing roller all have a straight geometry. The cage may be made of brass, steel, or polyamide. You can separate the outer and inner rings. As the roller makes line contact with the raceway, these bearings can support significant radial loads. The bearings come in a variety of styles and dimensions. Cylinder roller bearings are of different types:
  • Single row
  • Double row
  • Four rows
  • Full Complement
  • Thrust cylindrical roller
Application of cylinder roller bearings: Mining, petroleum production, rubber mixing equipment, electric motors, rolling machines, etc. Advantages of cylindrical roller bearings:
  • They offer excellent stiffness
  • These bearings can face challenges of heavy radials and high speed.
  • It comes in split and sealed variants
  • Low friction
  • Long service duration
  • Not suitable for thrust loads
  • When the inner or outer rings have two ribs, cylindrical roller bearings can withstand some axial load in one direction.
  • Double-row cylindrical roller bearings are utilized largely in precision machine tools and have high radial stiffness.
Taper roller bearings
In general, taper roller bearings application can be mounted independently from the cup because the cone assembly, which consists of the inner ring with roller and cage, is removable (outer ring). Mounting is made simpler by being detachable. The appropriate rolling motion of the roller on the track surfaces of the cone and cup is ensured by the projection lines of all the taper surfaces (Cup, Cone, and Roller) meeting at a single point on the bearing axis, known as the apex point. Single and double-row taper roller bearing applications in inch and metric series are produced by NBC. Taper roll bearing is further divided into
  • Single row
  • Double row
  • Four rows
  • Tapered roll thrust
Application of taper roll bearings: Agriculture, construction & mining industries, sports robot combat, propeller shaft, engine motors and reducers, wind turbines, etc. Advantages of taper roll bearings:
  • Low friction
  • Long service life
  • Rigid bearing applications
  • Separable and interchangeable
  • Enhanced operational reliability
  • Not suitable for high engine speed.
  • Increase heat due to large contact surfaces.
Spherical roller bearings Self-aligning spherical roller bearings in industrial appliocations are designed for high radial loads. They automatically make up for significant angular faults (shaft misalignments). They typically have a two-row arrangement, with shared spherical raceways in the outer ring between both rows of rollers. Spherical roller bearings are divided into
  • Spherical rollers.
  • Spherical roller thrust bearings.
Application: Industrial gearboxes, conveyors, cement grinding rolls, passenger coach axle boxes of railways.  Advantages:
  • High load-carrying capacities
  • Low friction
  • Self-aligning
  • Reduce noise and vibration levels
  • Extended service life
  • Lower limit speed
  • Poor heat dissipation with compound material
  • Relatively high starting friction 
Needle roller bearings Typically, needle rollers and cages make up needle roller bearings. To facilitate flawless rolling action, several needle rollers are put between two hardened, smooth surfaces, and a cage prevents the needle rollers from touching one another. Needle roller bearings have relatively tiny roll bearing application diameters and great length-to-diameter ratios, which increases load-carrying capacity and makes them perfect for oscillation motion. Further divided into
  • Needle roller and cage assembly
  • Shell-type needle roller bearings
  • Machined ring needle roller bearings
  • Thrust needle roller bearing
Application: rocker arm pivot, pumps, gearboxes, two or more stroke engines, etc. Advantages:
  • Convenient at high and low temperatures
  • Easy lubrication
  • International standards and specifications are uniform.
  • Easy to get interchangeable products
  • Fewer friction
  • Loud noise
  • Complex structure
  • Fatigue.
We don’t frequently see these products immediately in our daily lives, such as machines that produce energy, materials, or machining equipment. However, as we’ve mentioned in this blog, a lot of bearings in industrial applications. These bearing applications help our daily life in addition to the force and rotation. Additionally, the functionality required of bearings is growing, and bearings suitable for many applications are in high demand. NBC, the leading bearing manufacturer, is acknowledged for its excellent quality and delivery.  

Applications Of Roller Bearing In Heavy Machinery

The roller bearing is used in the mobilization of machinery to reduce friction between moving parts. The different types of roller bearings are used in heavy-duty machinery that supports radial, axial and thrust loads. This blog discusses various applications where roller bearings are used in heavy machinery.  The bearings are made to support complex mechanical systems and their vitality can be observed in their application in a multitude of machinery. Be it automobiles, aeronautics, railways, earthmoving or agriculture, the roller bearings can be used perfectly to match the needs of different heavy-duty applications.  While referring particularly to a roller bearing, they are designed in such a way to support performance in those applications where there are large axial and radial loads. The Roller Bearings consist of the outer ring, inner ring, and a window cage which works as a holder for the rollers.

Design of Roller Bearing – Supporting Heavy Machinery

Roller Bearing helps in support the large radial and axial loads in heavy-duty machinery. This works in one direction to guide the axial loads while complimenting bearings are also used simultaneously to support the load in other directions. These types of bearings can be widely used in those conditions where the temperature may vary between -30 degrees celsius to 120 degrees Celsius.

Applications of Roller Bearings in Heavy Machinery

There can be varied types of Heavy Machinery that might require heavy-duty applications. Here are some of the applications of roller bearings in heavy machinery:
  • Wind Turbine Generators for Energy Generation – Wind Turbine generators are usually installed in high-altitude areas which require a reliable bearing solution that can operate within the high-performance wind turbines in high-speed winds. In such conditions, the tapered roller bearing and spherical roller bearings can be installed in the main shaft of the wind turbine that receives the force and can pass on the rotation to the generator.
  • Use of Roller Bearing in Agriculture Machinery – The agriculture industry also demands heavy-duty machinery as it has to deal with heavy-duty applications on a day-to-day basis. While these applications range in a multitude of high-performance tasks, the bearings must be reliable and long-lasting as they have to be used in heavy dirt and mud conditions which might also impact the bearing life. The roller bearings are one such perfect solution that can be used in varied tasks which might require heavy radial or axial loads and they can get the work done with ease. The common type of bearing used in the agriculture industry is a tapered roller bearing.
  • Construction and Heavy Machinery – The construction industry requires varied earth-moving equipment for a high range of heavy-duty tasks. While there can be varied challenges while dealing with the applications of construction, the bearings are usually exposed to excessive working conditions as machines have to be deployed for high-performance tasks. In order to meet this demand, there is a need for different types of roller bearings such as spherical roller bearings, tapered roller bearings, cylindrical roller bearings, etc. which are designed to deliver the desired performance.
  • Use of Roller Bearings in Railways – The railways are considered one of the most reliable modes of transport worldwide. While there are different systems, trains, and tracks connected over wide networks, heavy-duty machines are used to facilitate day-to-day operations. The bearings in the railway industry are used in traction motors, drive units, wheel axles, etc. While the bearings have to work in extreme conditions of carrying heavy loads and adapting to high vibrations in drive units, varied roller bearings like tapered and spherical roller bearings are also widely used to support the mechanical system. Since the railway network is now moving towards high-speed trains, the roller bearings are also designed especially for double helical gears which can work for a longer duration without the need for lubrication.
  • Use of Spherical Roller Bearings in Marine Propulsion  – Marine propulsion can be referred to as a thrust system that is used to move a boat or a giant ship. While this is also considered in the category of heavy-duty application, the diesel engine of the ship is linked to the propeller which facilitates the movement through a complex system. Here, roller bearings can be used within the shaft or different mechanical systems as there can be conditions where the bearing has to adjust to radial or axial load while also complying with the scope of heavy misalignment. These kinds of bearings are designed to handle one-directional axial load and radial load at the same time while allowing shaft misalignment.
Conclusion While heavy-duty applications use bearings within the machinery, the complex working conditions can make bearings tough to work as desired. In such cases, the different types of roller bearings are used to facilitate high-performance working conditions ensuring the reliability and longevity of bearings in multiple ways.

Things To Keep in Mind Before Purchasing Bearings For Industries

Bearings are available in different shapes, sizes, and types which may be specific for different applications in varied industries. This blog covers some of the points which you should keep in mind before purchasing bearings for industries. The bearings are high-precision components that power rotating assemblies in mechanical systems. Be it automobiles or aeronautics, it can be used everywhere in any size to accommodate acceleration and reduce friction between different parts or mechanical elements. The bearings are designed in such a way to make it work at high speed without generating much noise and vibration. Since varied industries might require bearings for different applications, you must consider a few things before purchasing them. Things to Keep in Mind Before Purchasing Bearings for Industries There can be various factors that might play a role in choosing the right kind of bearing depending upon your applications. Here are some of them to help you understand it right:
  1. Understanding Operating Conditions: The different applications might require different operating conditions which may vary in aspects such as loads, shaft requirements, the precision of radial positions, shaft strength requirements, etc. In such cases, it is recommended to determine which type of bearings are designed for such applications.
  1. Bearing Type and Arrangement: Bearing arrangements are a crucial factor to determine the support and location of shafts. It can be an axial or radial location where support may be required to position a shaft. For instance, bearing type and arrangement requirements can range as per location and non-locating bearing combinations where different types of bearings such as deep groove ball bearing or cylindrical roller bearings can be used. So, before planning the applications for bearings, it is crucial to understand which type of bearing and arrangement is required.
  1. Bearing Loads: It can be referred to as transferring of force from bearing to other rolling elements or bearing rings. The load generally can be axial, radial, or combined load. During the process of choosing a bearing for industrial application, it is crucial to first understand the type of the acting load and then plan which types of bearings might suit well in such an application.
  2. Considering Bearing Size: The bearing size should be adequate and precise in terms of its application. If bearing size is not considered in the right manner then it might result in rolling contact fatigue, breakdown, and deformation or might also decrease its service life.
  3. Lubrication Criteria While Selecting Bearing: It is also important to consider lubricating criteria while choosing the type of bearings. By referring to lubricant criteria, it suggests which type of lubricants such as oil or grease will be used in bearings.
  4. ISO Tolerance Classes: It signifies the tolerance capability of bearing under varied performing conditions. To understand it better, The ISO 492 Class 5 standard signifies the ability of a particular bearing to withstand tolerance limits while using it for high-performing or high-speed rotational applications.
  5. Bearing Internal Clearance: The bearing internal clearance defines how much a bearing ring can move relative to other rings in radial or axial directions. It signifies the operation of the bearing in a satisfactory manner without any constraints. This is also one of the key factors to consider while choosing bearings for industrial applications.
Conclusion The bearings can be considered vital components of any machinery or mechanical system. While it allows in reducing friction between various components, it also enables machinery and its components to operate well without any challenges. Before purchasing bearings for industries, it is crucial that you should consider varied factors to ensure optimum performance and functioning. Hopefully, the insights and points mentioned in this blog will help you get the right bearings perfect for your use case.