Four Row Tapered Roller Bearing

Four row tapered roller bearing are used to support work rolls in rolling mills. They must be able to withstand heavy, impact and shock loads transmitted radially and axially as steel passes through the roll necks.

To achieve this, long-life Super-TF bearings are constructed from specially developed steel with higher austenite content and special heat treatment to reduce damage in heavily contaminated environments. They are also lubricated to provide reduced friction, noise and heat.

High Load Capacity

Four row tapered roller bearings have the capability to withstand both radial and thrust loads. They can also support moment loads. This makes them a good choice when your application requires high rigidity. They can be easily mounted and used in a wide range of applications.

Compared to cylindrical roller thrust bearings, four-row tapered bearings are less susceptible to deflection. This makes them suitable for use in applications where shaft position is critical, such as in machine tools.

The bearings are assembled with a cage, rollers and inner and outer rings. The flanges on the outer ring and the raceways prevent the rollers from touching each other at the apex of the cones. They are available with different contact angles to suit specific load conditions. These are classified as normal, medium and steep angle. The codes for these are given in the bearing designations, with the code for the inner ring assembly (cup) followed by the code for the outer ring assembly (cone). Spacer-assembled double-row tapered bearings have the same design, but their apexes are separated by spacers.

High Speed Capacity

Unlike needle roller bearings, tapered roller bearings can withstand both radial and axial loads. Due to their bidirectional load-carrying capability, they are capable of taking combined (radial and axial) loads at low to moderate speeds and are commonly employed in work roll applications such as rolling mills.

The axial load capacity of four-row tapered roller bearings is determined primarily by their contact angle. Generally, the larger the contact angle, the higher the axial load capacity.

In order to increase the reliability of four-row tapered roller bearings for rolling mills, they can be equipped with sealing and lubrication systems. Additionally, four-row tapered roller bearings with optimized bearing design can also improve load resistance and operating life under extreme conditions such as contaminated operation or insufficient lubrication. These high-performance products are called X-life bearings and are available in different sizes. They feature reduced dimensional and running tolerances that provide better load distribution while reducing stress peaks. The result is a significant improvement in loading capacity and long service life.

Environmentally Friendly

Four row tapered roller bearings are a good choice for environments with dust and other contaminants that can affect the life, function, and precision of standard bearings. They are also capable of surviving high-speed operation.

Unlike other types of bearings, the rollers of tapered roller bearings have end diameters that are two different sizes. They are separated by a cage, also known as a retainer, which keeps the rollers at a fixed distance apart and helps distribute load. The cage is usually made of a polymer.

Moreover, the bearings are sealed and can withstand high-speed operation. They are able to handle radial and axial loads, as well as moment loads. The taper angle on the inner raceway and outer ring determines the type of load the bearing can carry. These characteristics make them a popular choice for work roll applications in rolling mills. The larger the angle, the greater the axial load capacity. In addition, the bearings can withstand high-speed applications without causing vibration or damaging components.

High Precision

Four row tapered roller bearings are used in the work rolls of rolling mill stands to support radial and axial loads transmitted from the rolling process. They must also withstand large starting and running torques, as well as fast acceleration and deceleration.

These high-precision bearings have a lower surface roughness than standard bearings, making them more conducive to the formation of lubricating oil films. This results in less friction and heat, which can damage machinery and lead to malfunctions.

Unlike double-row tapered roller bearings, four-row tapered roller bearings can handle combined loads (radial and axial load). Their cups are separable for easy installation. Moreover, they can be easily adjusted for axial clearance and preload mounting. These features make them ideal for heavy machinery.