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Design
Ball screw bearings series, shorten as BS bearings, is designed to maximize smaller ball numbers with thicker I/R & O/R and 60 degree contact angle. This design allows BS bearings have greater axial rigidity than any other TPI angular contact bearing series like standard ball bearings.
HBS bearing is designed to accommodate heavy load applications, such as plastic injection molding machines. Compare to BS bearings series, HBS bearing provides relatively higher load rating and stiffness.
Inner and outer rings
Carbonitriding on both inner and outer rings is a basic hardening process for TPI BS bearings. Through this special heat treatment, hardness on the raceway surface is increased; which reduces wear accordingly.
Rolling element
High precision steel balls ensure TPI ball bearings suppliers' BS bearings and HBS bearing have the best precision and stability. This also reflects in BS bearings performance under high speed rotation.
Cage
With the highly engineered arrangement of cages, remarkable characteristics were achieved.
T2 cage, desinged for low noise level, however, the temperature rise in high RPM is relatively high.
Seal
Contact seal, prevent dust and liquid contamination from getting into BS bearings. However, the torque will be higher and the limiting speeds will be lower under such application.
The non-contact seal provides general protection for BS bearings. It cannot prevent liquid contamination from getting into BS bearings. Torque and limiting speeds are the same as the open type.
Grease
TPI two wheeler bearings supplier cooperates with the best grease manufacturers in the world which allows us to suggest and apply the best lubricating selection for our customer.
Life
Bearing life is usually expressed as the number of hours an individual bearing will operate before material fatigue develops on either the raceways or the rolling element. The usual life rating for industrial applications is called “L10” life. The L10 life is the number of hours which that 90% of bearings will survive; or, conversely, 10% of bearings will have failed in the L10 number of service hours.
Preload / Rigidity
System rigidity, one of the main factors of productivity and accuracy when it comes to machine tools and other precision applications. By preloading the bearings, it becomes extremely rigid and the magnitude of elastic deformation becomes neglectable.
Arrangement
BS bearings and HBS bearing in duplex arrangements vary in combinations of two, three, or four, in accordance with the user's required specifications. Back-to-back duplex (DB) arrangement and face-to-face duplex (DF) arrangement can both sustain radial and axial loads in both directions. The wider distance between the effective load centers of the DB arrangement allows larger moment loads to be handled.
Designation
The designation indicates the form, size, precision, internal structure, etc. of the bearing, and it's shown as below:
| Ball material | Blank | SUJ2 (Steel ball) |
| Bearing series | BS | Ball screw support bearing (Contact angle 60°) |
| Bore and outer diameter number | 1747 - 100215 | Shown (I.D.)mm (O.D.)mm |
| Matching code | DB | Back to back arrangement |
| DF | Face to face arrangement | |
| DT | Tandem arrangement | |
| DBT | Tandem and back to back (triple-row) | |
| DTBT | Tandem and back to back (quad-row) | |
| Flush grinding | G | Flush ground type |
| Blank | Without flush ground | |
| Preload codes | GL | Light preload |
| GN | Normal preload | |
| GM | Medium preload | |
| Accuracy | P4 | JIS standard class 4 |
| UP | JIS standard UP | |
| P4A | JIS standard class 4, Special bore and outside diameter tolerance |
