Timken Super Precision Bearings for Machine Tool Applications

ENGINEERING
A
Fig. 78. Two designs of the Hydra-Rib bearing.
TS(F) and Hydra-Rib
A typical spindle arrangement is the combination of a Hydra-Rib
bearing with a single-row TS bearing (Figure 79). The Hydra-Rib
bearing is fitted at the tail position and the TS bearing at the nose
position of the spindle. The outer ring rib simplifies the lubrication
at high speed since the natural flow of the oil under centrifugal
effect feeds the oil to the rib. A simple axial oil inlet above the cage
on the small roller end is therefore sufficient for lubricating the
Hydra-Rib bearing.
TSMA and Hydra-Rib
Figure 80 shows the same arrangement with a TSMA bearing. This
arrangement allows the widest range of operating speeds, under
optimum preload.
Pressure control
Pressure control
Fig. 79. Simple mounting with a Hydra-Rib cooled by an axial oil
inlet and a TS bearing with oil jets at both end of the rollers for
inlet and cooling.
Fig. 80. Simple mounting with a Hydra-Rib bearing cooled by an
axial oil inlet and a TSMA bearing with oil jets at both ends of the
rollers for inlet and cooling.
96 TIMKEN MACHINE TOOL CATALOG