Product By Category
Bearing
A rolling bearing is a type of bearing that carries loads by means of rollers (balls or rods) between two bearing rings (races). The relative motion of the two bearing rings allows the rollers to move with very little sliding friction and rolling friction.
The structure of a normal rolling bearing consists of four main parts: inner ring, outer ring, balls (or rollers), and spacer (surrounding and maintaining the distance between the rolling balls). The inner and outer rings usually have grooves for the balls or rollers to run. The inner ring is mounted on the shaft collar, the outer ring is mounted on the shaft seat (machine housing, machine body). Normally, only the inner ring rotates with the shaft due to contact through the shaft collar, while the outer ring remains stationary. However, there are also some designs with the outer ring rotating with the shaft seat while the inner ring remains stationary with the shaft (as in the roller bearing of a car wheel).
Ball Bearings
- Radial Ball Bearings
Deep Groove Ball Bearing (DGBB)
The most typical type of bearing, these are used in a wide range of fields. They include grease-enclosed sealed and shield bearings for ease of use. Other types include bearings with a locating snap-ring to facilitate positioning when mounting the outer ring, expansion compensating bearings that absorb variations in bearing fitting surface dimensions due to housing temperature, and TAB bearings that are resistant to contamination in lubricating oil.
Angular Contact Ball Bearing (ACBB)
In these ball bearings, the direct line that connects the inner ring, balls, and outer ring has a given angle in the radial direction (the contact angle). This angle is generally designed with three kinds of contact angle. These bearings can bear axial loads, but because of the contact angle cannot be used singly and must be used in pairs or combinations.
Self-Aligning Ball Bearing
These ball bearings have a spherical surface with a point at which the center of the outer ring track surface matches the center of the bearing, and the inner ring has a two-row track groove. The balls, cage, and inner ring are able to tilt freely to a degree with respect to the outer ring, and rotate. As such, misalignment caused by processing errors in the axis or housing, or by mounting of the bearing, is automatically corrected. However, as the capacity to bear axial loads is not so great, the bearings are not suited to locations with large axial loads. The bearings are often used in applications such as drive shafts, as mounting and un-mounting are easy if an adapter is used for bearings with tapered bore calibers.
Single-direction thrust ball bearings
These bearings have balls enclosed in a cage between the shaft raceway washer that corresponds to the inner ring, and the housing raceway washer that corresponds to the outer ring. They can bear only single-direction axial loads.
Cylindrical Roller Bearings (CRB)
Cylindrical Roller Bearings (CRB)
These use rollers as the rolling elements and have a high load capacity. The rollers are guided by the ribs of the inner or outer ring. The inner and outer rings can be separated to facilitate assembly, and both can be fitted tightly. On types with no ribs, either the inner or the outer ring can move freely in the axial direction, making cylindrical roller bearings ideal for use in free side bearings that absorb shaft expansion. On types with ribs, the bearing can bear a slight axial load between the roller end surfaces and the ribs. Cylindrical roller bearings include the HT type that modifies the shape of roller end surfaces and ribs to increase axial load capacity, and the E type that has a special internal design to increase radial load capacity. The E type is standard for small-diameter sizes.
Double row / Four row CRB bearings
These are used in the printing cylinders of printing machinery, rolling mill rolls, and the main shafts of machine tools, where thin-walled bearings are required. In the main shafts of machine tools, the radial inner clearance is adjusted by pushing the tapered shaft into the inner ring of the tapered bore.
Tapared Roller Bearings (TRB)
Tapered Roller Bearings (TRB)
Tapered roller bearings are designed so the inner and outer ring raceway and the apex of the tapered rollers intersect at one point on the bearing centerline. For this reason, the rollers are pushed against the inner ring rib and roll guided by the rib, receiving the loads from the inner ring raceway surface and the outer ring raceway surface as a combined load on the raceway surface. Component force is produced in the axial direction when a radial load is applied, so the bearings must be used in pairs. The inner ring with rollers and outer ring separate, facilitating mounting with clearance or preload. However, assembled clearance is hard to manage and calls for attention. Tapered roller bearings are capable of supporting large loads, both axial and radial.
Double Row Tapered Roller Bearings (Double row TRB)
These have outward-facing types (for double-row outer ring use) and inward-facing types (for double-row inner ring use). As the inner clearance is adjusted to a set value, the bearings must be used in combination with components of the same product number, as marked. In addition to duplex bearings that combine a pair of single row tapered roller bearings, there are also four-row tapered roller bearings composed of two double-row inner rings, one double-row outer ring, and two single-row outer rings. Four-row tapered outer bearings are used in high-load applications such as rolling mill roll necks.
Spherical Roller Bearings (SRB)
Spherical Roller Bearing (SRB)
These bearings have an outer ring with a spherical track surface, and an inner ring that encloses two rows of barrel-shaped rolling elements. Various types exist that differ by internal design, including bearings with a tapered bore inner caliber. The bearings are easily mounted on the shaft with an adapter or un-mounting sleeve, and are used in many industrial machines for their high load capacity. Potential troubles include one row bearing no load when axial load is large, calling for attention to usage conditions.
Spherical Roller Thrust Bearings
These bearings have a self-aligning nature that uses barrel-shaped rolling elements, with a spherical surface on which the raceway surface of the housing raceway washer (outer ring) is centered on the guide sleeve. They can bear high axial loads. As there are many sliding surfaces such as the roller end surfaces and the cage, oil lubrication must be used even in low-speed operation.
Needle Roller Bearings (NRB)
Needle Roller Bearings (NRB)
These bearings use small needle rollers, 6mm or less in diameter with a width 3 to 10 times diameter, as rolling elements. As such, they feature low cross-section height, high load capacity relative to dimensions, and high rigidity due to the number of elements, and are suited to wobbling or pivoting motion.`
Bearing Units(BU) / Plummer Blocks
Bearing Units
Information on various series of NTN bearing units with improved functions for applications that require properties such as housing rigidity, cleanliness, corrosion-resistance and ease of mounting.
Plummer Blocks
An assembly consisting of a spherical roller bearings or self-aligning ball bearing and a bearing housing with a sealing device. The bearing housing is generally made of cast iron, but can also be spheroidal graphite cast iron (Ductile cast iron) or cast steel depending on the application. A felt seal, rubber seal, or labyrinth seal is used as a sealing device.
After-Sales and Maintenance Products
Portable Vibroscope
Facilities do not always operate under ideal conditions, making constant diagnostics essential. The NTN Portable Vibroscope offers remote precise vibration measurement and analysis, enabling early fault detection and stable equipment operation.
Lubrication for Bearings
Bearings, mechanical components and industrial processes require reliable, appropriate lubrication if they are to operate at optimum efficiency over the long term. In addition to its quality bearings, Experts & Tools also provides you with the expertise and products you need to control this fundamental part. The LUB’SOLUTIONS product range includes lubricants specifically selected for the various applications, as well as all the resources needed to reliably distribute the right volume required by each mechanical component. But above all, LUB’SOLUTIONS has experts on hand to help you implement solutions tailored to your environment. From advice on defining your needs to the implementation of lubrication systems for your application, including customised solutions, our technicians are on hand to solve your problems. LUB’SOLUTIONS is the spirit of Experts & not facilities to onilities.
Green Energy Products
Green Energy Product
NTN offers products that generate electricity with compact wind turbines utilizing high efficiency blade technology and solar panels. Transportable Independent Power Supply “N3 N-CUBE” can be transported to locations where needed by trucks and other means, generate and supply electricity. “NTN Green Power Station,” a stationary power supply, can be used in a wide range of applications by automatically turning on LED lightning at night and installing various devices according to the uses
