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KOYO 83a915 Bearing

 

Thrust Bearings

A thrust bearing is a particular type of rotary bearing. Like other bearings they permit rotation between parts, but they are designed to support a predominantly axial load.

Thrust ball bearings, composed of bearing balls supported in a ring, can be used in low thrust applications where there is little axial load.
Cylindrical thrust roller bearings consist of small cylindrical rollers arranged flat with their axes pointing to the axis of the bearing. They give very good carrying capacity and are cheap, but tend to wear due to the differences in radial speed and friction which is higher than with ball bearings.
Tapered roller thrust bearings consist of small tapered rollers arranged so that their axes all converge at a point on the axis of the bearing. The length of the roller and the diameter of the wide and the narrow ends and the angle of rollers need to be carefully calculated to provide the correct taper so that each end of the roller rolls smoothly on the bearing face without skidding. These are the type most commonly used in automotive applications (to support the wheels of a motor car for example), where they are used in pairs to accommodate axial thrust in either direction, as well as radial loads. They can support greater thrust loads than the ball type due to the larger contact area, but are more expensive to manufacture.
Spherical roller thrust bearings use asymmetrical rollers of spherical shape, rolling inside a house washer with a raceway with spherical inner shape. They can accommodate combined radial and axial loads and also accommodate misalignment of the shafts. They are often used together with radial spherical roller bearings. Spherical roller thrust bearings offer the highest load rating density of all thrust bearings.[1]
Fluid bearings, where the axial thrust is supported on a thin layer of pressurized liquid—these give low drag.
Magnetic bearings, where the axial thrust is supported on a magnetic field. This is used where very high speeds or very low drag is needed, for example the Zippe-type centrifuge.
Thrust bearings are commonly used in automotive, marine, and aerospace applications. They are also used in the main and tail rotor blade grips of RC (radio controlled) helicopters.

Thrust bearings are used in cars because the forward gears in modern car gearboxes use helical gears which, while aiding in smoothness and noise reduction, cause axial forces that need to be dealt with.

Thrust bearings are also used with radio antenna masts to reduce the load on an antenna rotator.

One specific thrust bearing in an automobile is the clutch "throw out" bearing, sometimes called the clutch release bearing.

KOYO 83a915 Bearing
KOYO 83a915 Bearing
30 mm
2 x FRB 22/600
SKF  BFSB 353320/HA4 Tapered Roller Thrust Bearings
SKF BFSB 353320/HA4 Tapered Roller Thrust Bearings
2 x TK 76
MS 3172-68
SKF  BFSB 353312/HA1 Cylindrical Roller Thrust Bearings
SKF BFSB 353312/HA1 Cylindrical Roller Thrust Bearings
814 mm
6.4 mm
SKF  BFSB 353210 Thrust Bearings
SKF BFSB 353210 Thrust Bearings
4.734 kN
17 mm
SKF  BFSB 353901/HA4 Needle Roller and Cage Thrust Assemblies
SKF BFSB 353901/HA4 Needle Roller and Cage Thrust Assemblies
56.00 mm
345000 N
SKF 351573 Custom Bearing Assemblies
SKF 351573 Custom Bearing Assemblies
22 mm
20 mm
SKF  BFSB 353247 Screw-down Bearings
SKF BFSB 353247 Screw-down Bearings
HME 31/630
M 8
SKF  BFSB 353201 Tapered Roller Thrust Bearings
SKF BFSB 353201 Tapered Roller Thrust Bearings
198.438 mm
57.15 mm
SKF  BFS 8000/HA1 Thrust Bearings
SKF BFS 8000/HA1 Thrust Bearings
66.7 kN
0.75 in
SKF 353164 Custom Bearing Assemblies
SKF 353164 Custom Bearing Assemblies
2.81 kg
K 81230 M
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