Double-row tapered roller bearings are pre-adjusted units normally formed by two inner units and a double outer ring. Furthermore, they are usually greased and fitted with a set of seals preventing both the entrance of pollutants and the loss of grease.
The arrangement of the inner units allows the bearing to withstand large axial and radial loads in two directions and their axial capacity will depend on the angle of contact of the outer ring raceway.
Due to geometry, the effective load centres are far apart, which affects the bearing, giving it great rigidity. This allows it to be used in applications where there are high turning torques.
The most typical application of this kind of bearing is to replace the pair of bearings in wheel applications by a single double-row unit which also impacts greater ease of assembly and maintenance.
Un resumen de sus características operacionales lo podemos ver en el siguiente esquema:
RADIAL
LOADS |
AXIAL
LOADS |
COMBINED
LOADS |
HIGH
SPEED |
| EXCELENTE |
GOOD |
EXCELENTE |
ACCEPTABLE |
HIGH
PRECISION |
RIGIDITY |
DISALIGN.
ANGULAR |
SEPARABLE
RINGS |
| NOT APPLICABLE |
EXCELENTE |
POOR |
APPLICABLE |
FERSA manufactures these types of bearings in both Metrics and Inches dimensions in these following ranges:
| DIMENSIONS RANGE |
d |
D |
T |
| Car |
Min |
mm |
25,000 |
52,000 |
37,000 |
| Max |
48,000 |
84,000 |
48,000 |
| Min |
Inches |
0,9843 |
2,0472 |
1,4567 |
| Max |
1,8898 |
3,3071 |
1,8898 |
| Trucks |
Min |
mm |
55,000 |
90,000 |
60,000 |
| Max |
110,000 |
170,000 |
140,000 |
| Min |
Inches |
2,1654 |
3,5433 |
2,3622 |
| Max |
4,3307 |
6,6929 |
5,5118 |