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Four-Row Tapered Roller Bearings
Four-row tapered roller bearings are radial loading rolling bearings having rolling components which are known as tapered rollers.

Four-Row Tapered Roller Bearings

There are two types of small cone angles that are mainly combined with radial and axial thrust, while large cone angles are mainly used for axial loads.

It is usually used in pairs and installed in reverse. The inner and outer rings can be installed separately. Four-row tapered roller bearings are loosely mounted on the roll neck for easy installation and removal. At the same time, the roll neck is lubricated to prevent the evaluation between the roll neck and the hole surface due to creep. Four-row tapered roller bearings should be loosely mounted on the rolls. Four-row tapered roller bearings are characterized by a spiral groove in the inner ring hole and an oil groove on the side of the inner ring. These grooves deliver lubricators to the contact surfaces of the inner ring, reducing wear.

Designation Common Features Of Four-Row Tapered Roller Bearings

They are designed to help the working rollers protrude heavy objects and affect the load applied by the stainless steel as it moves through the rolling belt, and reduce the thickness of four-row tapered roller bearings. Four-row tapered roller bearings need to work together to accommodate changing speeds as the bearing rapidly decreases and increases in speed.

  • Four row tapered roller bearings with high load carrying capacity
  • Four-row tapered roller bearings provide long service life under contaminated operating conditions
  • Four-row tapered roller bearings with steel-free glass and pin cages
  • Four-row tapered bearings prevent rolling shaft creep by means of spring chambers
  • Four-row tapered roller bearings are regarded as the best waterproof enclosed bearings
  • Four-row tapered roller bearings with waterproof grease
  • Inner ring anti-corrosion phosphate properties
  • Four-row tapered roller bearings with specified radial or axial internal clearance
  • Four-row tapered roller bearings are available in inch and metric types
  • The service life of four-row tapered rolling bearings is extended due to protection against water, scale or corrosion
  • Increased roll efficiency through stable operation
  • Shorter lead times for four-row tapered roller bearings
  • Four-row tapered rolling bearings save money
  • Extended Warranty for Four Row Tapered Roller Bearings
  • quick replacement
  • Four row tapered roller bearings for higher reliability
  • Reduced bearing replacement and maintenance intervals
  • Seal cleaning solution improves the performance of four-row tapered roller bearings,
  • Four-row tapered rolling bearings promote a safe working environment and significantly reduce grease consumption
Four Row Tapper Roller Bearing
Four Row Tapper Roller Bearing

Arranging The Four-Row Tapered Roller Bearing Set

Remove packing from bearing set. Do not wash off preservative oils. No effect on coating of four-row tapered roller bearings.

A four-row tapered roller bearing set consists of the following components:

  • 2 single-row cups, one double-row cup,
  • Two outer spacers, two inner cones with roller cage features,
  • 1 inner spacer and enclosed bearing,
  • two closed vectors

Make sure the bearing set is complete. Check the markings on the torus. Bearing designation, year and therefore consecutive numbers should be the same for all parts. To ensure proper bearing operation, all components of a four-row tapered roller bearing set shall be assembled and mounted on the ring face and spacer outside diameter in the order of letters A through E. Four-row tapered roller bearing parts are not interchangeable. Four-row tapered roller bearings have four load zones, marked on the surface of the outer ring with Roman numerals I to IV, each offset by 90°. Four-row tapered roller bearings also mention the location of load zone I and have an axis on the outer diameter of the outer ring. When assembling the bearing set,

Cages

cage
cages

The common material for the cages is polymer while sometimes the non-ferrous substantial is also used as a cage manufacturing material. If the capacity to bear the load needed to be increased, the number of rollers has to increase accordingly. Every aspect has a downside as well, by increasing the number of rollers the load capacity will increase but certain other significant parameters will undermine their performance such as speed, dynamic loads, and deceleration.

The cage of the four-row tapered roller bearings with associate degree outer diameter D> 650mm is usually designed as a pin-type cage. Four-row tapered roller bearings continue to be away from that of the four-row cylindrical bearing of constant size series. Four-row tapered roller bearings will face up to the characteristics of radial and biface axial hundreds.

Mounting Instructions
Four-Row tapered roller bearings should be coated with a thin layer of mounting paste. This is done to protect the bearing seats on the roll neck. It prevents the chock from fretting corrosion. Please check the mounting instructions in the mounting and assembly drawings. Bolt the cover on the roll body side firmly to the chock. Put the chock on the level to help to open the side along the vertical axis. Four-row tapered roller bearings are mounted on a base of four-row tapered roller bearings design either bearing with a pressed cage or bearings with a pin-type cage or closed bearings. Uphold the components of the bearing set and lower them into the chock in the specified mannered, beginning with the cup. The loading zone I markings on the cups should be aligned. We recommend positioning load zone I in the load direction. Make sure that adjacent parts are about each other completely and the seat in the chock does not get damaged by jamming.
Bearings with a pressed cage
Put the cone E-Ce flat on supports side E down. Then put the other parts on top in the correct order. Use the lifting device to carry the entire complete bearing set into the chock. Ensure that load zone I is aligned correctly.
Bearings with a pin-type cage(1)
Four-row tapered roller bearings, the cages are not the same as several alternative bearing variants. The cage that is seen most frequently with the tapered roller bearings is called the pin type cage. The rings utilized in forming such a cage are of varying sizes but joined together with an assembly of pins. These pins are extended at the circumference upon which the rollers are likely to be extended. To make sure the rollers are safely intact within the cage confinement, the outer ring is welded with the pins. In this way, the rollers in the cage have a unified assembly.
Four Row Taper Roller Bearing

Turning In The Four-row Tapered Roller Bearings

Lightly fasten the second bearing housing cap to the bearing housing using four opposing bolts. Rotate the bearing housing 90° to the horizontal position. The taper side fasteners are initially supported with tie rods. Clamping should only be done on the cone. The cage should not get stuck. Enclosed bearings and hoists are also used as clamps. To screw in the bearings, push in the cages until they only touch the cone. Gradually and evenly tighten the tie rod nuts and cap bolts, turning the cone continuously until the cone covers its entire circumference around the inner spacer with no play. Continue to check with a feeler gauge. Unscrew the cover bolts and remove the cover again. Put the desired thickness of seal into the lid. Bolt the cover firmly to the bearing housing and tighten the bolts laterally. Remove the clamp and apply lubricant to the taper hole.
Four-row tapered roller bearing turning
Four-row tapered roller bearing turning

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Four-row tapered roller bearing lubrication1

Lubrications For Four-row Tapered Roller Bearings

In every type of roller bearing, lubrication is the most important part because it helps smooth operation by reducing the amount of friction between the rollers and their paths. However, four-row tapered roller bearings have less opportunity for extra scrubbing of the raceways and rollers due to their construction. When properly lubricated, it has many other /contact-us/benefits besides reducing friction as it helps with noise reduction and heat dissipation. Due to the ease of installation, some additional lubrication holes are generally not included in the design.

Four Row Taper Roller Bearing Grease Lubrication
Grease Lubrication
Four-row tapered roller bearings are lubricated with a lithium soap base grease with high-pressure additives and a high level of corrosion protection. Unclosed bearings should be greased only after mounting as otherwise they may get contaminated. Apply lubricant on the bearing utilizing an oil gun until excess grease escapes on both sides of the bearing. If you have no grease gun, you should manually grease the roller-cage assemblies before being inserted into the chock. The relubrication period is measured for each specific application based on the prevailing operating conditions.
Four Row Taper Roller Bearing Oil Lubrication
Oil Lubrication
The operation system of four-row tapered roller bearings depending on the operating and environmental conditions can be operated using the following oil lubrication methods: oil sump oil-air or oil mist oil circulation The required oil amount is measured on a case-to-case basis.
Four Row Taper Roller Bearing Labyrinth Lubrication
Labyrinth Lubrication
When being mounted for the first time, the labyrinths must be filled well with grease and then use to relubricate at regular intervals. The same applies to oil-lubricated bearings.

Advantages of Four Row Tapered Roller Bearings

low friction

Friction is the biggest obstacle to smooth bearing operation. The optimized four-row tapered roller bearing design and special surface enhance the formation of a lubricating film, helping to minimize friction. This also reduces heat resistance and flange wear. In addition, bearings can better maintain preload and operate at reduced noise levels.

long lasting

The top raceway profile of the basic design bearing and the dynamic raceway profile of the four-row tapered roller bearing optimize the load distribution on the contact surfaces, reduce the strain peaks at the roller ends, and maximize the Reduced placement sensitivity. The cycle of four-row tapered roller bearings is generally longer. However, in any type of bearing, degradation is evident. Four-row tapered roller bearings require immediate replacement when signs of material degradation begin to appear.

The life of a four-row tapered roller bearing depends on the parameters are; the composition of the bearing material, the quality of the bearing manufacture, the type of load applied, the daily, monthly and yearly operating hours, what the operating conditions are, lubrication, and finally how much pollution it will withstand.

Enhanced operational reliability

An optimized surface finish on the contact surfaces of the rollers and raceways supports the formation of a hydrodynamic lubricating film. The surface finish of the bearing, raceway is improved by the additional support of the lubricating film. As a result, four-row tapered roller bearings are now more reliable in operation and can be trusted by customers.

Consistency of drum profiles and dimensions

The rollers incorporated in Coat-Master are manufactured to such close dimensional and geometrical tolerances that they are practically identical. It is offered optimal load distribution, decreases noise, and permits to set off a preload accurately.

Rigid Roller Bearing Feature

A one-row tapered roller bearing is often adjusted as opposed to a double-row tapered roller bearing. On applying a preload, a hard bearing application is attained. The surface finish of the bearings, raceways, is improved with the additional support of lubrication film. Thus, usually a robust and rigid application is obtained by applying the preload.

Running-In Period With Reduced Temperature Peaks

Four-row tapered roller bearings generally are running-in period, throughout that a standard tapered roller bearing faces a major amount of friction, leading to wear. This effect is detected as a temperature spike. The variations in the temperature such as too cool and sudden peaks to high temperatures will result in thermal expansion and contraction of the bearings. To cope with this scenario four-row tapered roller bearings are presented with a special type of lubrication that handles the extreme temperatures effectively and significantly reduced friction and provided the bearings mounting.

Separable And Interchangeable

The inner ring with rollers and cones should be installed separately from the cup. The entire large assembly of bearings cannot be installed at once. Four-row tapered roller bearings are of a separable design. Furthermore, the separable components are not securely attached, but can be removed and interchanged when needed. This facilitates installation, removal and maintenance inspection procedures. Four-row tapered roller bearings are designed to handle certain constraints such as space issues. Another major benefit of a separable design is ease of maintenance.

Where Are the Four-row Tapered Roller Bearings Used?

Worldwide, four-row tapered roller bearings are used in mill bearing arrangements when rolling speeds are lower than normal. Four-row tapered roller bearings are used for the work roll necks of hot or wet rolling stands, as well as the roll necks of brushless motor rolling mills. Sometimes the rolling necks of these bearings are installed immediately.

Do Four-row Tapered Roller Bearings Come With Spacer Rings?

This depends on the bearing design, as a four-row tapered roller bearing is constructed with an expanded inner ring that acts as the opposite of radial shaft loads. Additionally, these compartments may be supplied without or with spacers similar to Design TQOEN (eg Design TQOE).

What Preparations Are Necessary for Mounting the Four-row Tapered Roller Bearings?

Four-row tapered roller bearings are precision products whose service life is significantly reduced by contamination. Therefore, remove the initial packaging only after you have to complete the following preparations. Thoroughly clean the chock in the chock and on the roll neck. If any damage is found, such as scratches or turning marks, the housing should be reworked. Clean all lubrication and ventilation holes with compressed air and remove any debris with the help of a magnet. Check all mating parts for dimensional and form accuracy. Any burrs should be removed and each sharp edge should be snapped off. Finally, verify the dimensions and make sure the chock is on the roll neck inside the chock.

How Preloaded Bearing Improved the Shaft Care?

Preloaded bearings provide more shaft care because they provide higher stiffness, which minimizes the shaft’s ability to deflect under load. For example, preloading in bearings increases stiffness, which limits dramatic gear changes. This minimises power and reduces noise levels, allowing for longer gear life.

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