Page 15 - needle bearings

Classification and Characteristics of Bearings
NTN

This catalogue describes the following ones of linear motion bearings.

Linear ball bearing ʕʕ Machined ring type ʕʕ
This is a high precision bearing which comprises a
machined outer ring and face ring, steel balls and a
synthetic resin cage for retaining the balls and rolls
on a shaft, maintaining the endless linear motion.
¡Standard type, clearance-adjustable type and
open type are selectively available on application.
¡Some bearings of these types are provided with a
synthetic rubber seal at single side or double
sides to prevent invasion of foreign matter therein.
¡The steel balls are guided precisely by the cage so
that stable linear motion can be achieved with less
friction resistance.
¡No rotational motion is available.

Linear ball bearing ʕʕ Drawn cup type ʕʕ
This is a high precision bearing which comprises
an outer ring drawn from thin special steel plate by
precision deep drawing, steel balls and a synthetic
resin cage for retaining the balls and rolls on a shaft,
maintaining the endless linear motion.
¡The outer ring made of thin steel plate enables to
make less the section height and to design the
linear motion system of compact structure.
¡Easy to install ʕ This bearing is press-fitted in the
housing so that it requires no axial fixing.
¡No rotational motion available.
¡Some bearings of this type are provided with a
synthetic rubber seal at double sides to prevent
invasion of foreign matter therein.

Linear ball bearing ʕʕ Stroking type ʕʕ

This bearing comprises a machined outer ring and
face ring, steel balls and a cage for retaining the
balls and reciprocates finitely on a shaft as well as
rotates on a shaft. The outer ring is provided with a
snap ring as the cage stopper at its double sides
and, furthermore, a wavy spring is provided between
the snap ring and the cage to damp impact acting the
cage and to thereby prevent wear of the cage.
¡Some bearings of this stroking type are provided
with a synthetic rubber seal at its double sides to
prevent invasion of foreign matter therein.
¡The outer ring is so grooved that snap ring can be
fitted and fixed easily.

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