bearings are single row angular contact ball bearings, comprising
solid inner and outer rings and ball and cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements assemblies with solid
window cages. They cannot be dismantled. The bearings
are available in open and sealed designs.
bearings have restricted tolerances. They are particularly suitable
for bearing arrangements with very high requirements for guidance
accuracy and high speeds. They have proved extremely suitable for
main spindle bearing arrangements in machine tools.
detailed description of spindle bearings (designs, calculation, lubrication,
speeds, fits) is given in Catalogue AC 41 130, Super Precision
Radial and axial load╳ Force acting in the direction of the shaft. capacity
bearings can support axial forces in one direction as well as radial
forces. Spindle bearings used in an O or X arrangement╳ Semi-locating bearing arrangement with contact lines in an X arrangement can support
axial forces in both directions and moments. Bearings in a tandem arrangement
can only support axial loads in one direction.
High speed spindle bearings HSS70 and HSS719 have
smaller steel balls.
With ceramic balls
addition, high speed
spindle bearings HCS70 and HCS719 with ceramic balls (hybrid bearings)
four series thus achieve higher speeds, have lower friction╳ The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions and
heat generation, place less strain on the lubricant╳ Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements. and have a longer operating
bearings are sealed on both sides by gap seals.
bearings of series HS70 and HS719 as
well as HC70 and HC719 are
ultra bearings have bearing rings made from a nitrogen-containing,
corrosion-resistant steel with a particularly fine structure (prefix
X) and ceramic balls. They fulfil very high requirements
for speed and load╳ Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.
See Contact surface carrying capacity. The bearings have longer life╳ The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops compared
to conventional bearings. Most series of spindle bearings are available
as X-life ultra bearings.
Direct Lube bearings
the limits of grease╳ See Lubricant Grease cartridge Fatty acidslubrication╳ Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.
bearings of universal design can be fitted in any arrangement
or combined in various sets without any loss of performance.
The position of the pressure cone is marked on the cylindrical
surface of the outer ring.
with the suffix UL are designed for slight preload
in an X or
preload is altered by mounting and the operating conditions.
ordering, the number of individual bearings must be stated.
bearings are suitable for operating temperatures from –30 °C to +100 °C,
restricted by the seal╳ Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary or cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements material.
operating temperature must be taken into consideration when selecting
bearings have solid window cages made from hard fabric (suffix T).
The cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements is guided on the outer ring.
the chemical resistance of the seal╳ Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary or cage╳ The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements material to synthetic
greases and lubricants with EP additives.
oil and additives╳ Lubricant additive to improve viscosity-temperature behaviour or pour point, prevent corrosion, oxidation or ageing or reduce wear or foaming in the oil╳ Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives. can impair the operating life╳ See Life, rating of the cages and
seals at high temperatures.