tapered roller thrust bearings
Screw-down bearings are mainly used in the screw-down of rolling
mills. This type of bearings has no cage and full of tapered
rollers, so that can carry high axial loads and have low limiting
speed. In order to improve the performance, the underside of the
shaft washer is concave spherical surface (type TTSV00) or convex
spherical surface (type TTSX00), they cooperate with the spherical
side face of housing screws which have the same radius of curvature
and are through precise finish, and both of them are uniform
contact, so ensuring uniform stress of bearings when housing screws
have obliquity relative to axial of bearings.
The bores of housing washers are screwed. The inner bores of shaft
washers are also screwed for large-size bearings .These screw
threads are used to install the lifting eye bolts.
The lube with extreme pressure additive should be chosen to form
the lubricant film under heavy loads.
The lube with extreme pressure addictive should be chosen to form
the lubricant film under heavy loads. On the spherical surface of
shaft washer, dry film lubricant should be coated being well
lubricated and aligned easily.
Screw-down bearings permit the angular movement of the screw
spindle with respect to the support. It is suitable for very high
axial loads and it is equipped with very long rollers of large
The shaft washer surface is ground to convex spherical surface TTSX
type (4397/00 type) or concave spherical surface TTSV type (4297/0
type) to suit screw down spindle on the rolling mill, contact
averagely the end face shape of screw down spindle. The bearing
make sure the load on it average when some misalignment arises out
of the axis and axis and screw down spindle. We must not mount the
roller mixedly because the rollers of the bearing can’t been
exchanged, and should make the bearings full of or grease.