Page 17 - needle bearings

Classification and Characteristics of Bearings
NTN

This catalogue describes the following products, too.

One-way clutch
This one-way clutch comprises an outer ring
drawn from thin special steel plate by precision deep
drawing, spring, needle rollers and cage and can
transmit a torque in only one way.
¡Less friction torque against over-running, great
transmission torque for small section height.
¡Various types are available as follows; one-way
clutch with bearing built therein to support radial
load, one-way clutch with outer ring plated for
improvement of erosion resistance, one-way
clutch integrated with gear, pulley, etc.
¡HF type and HFL type can be locked axially by
being only press-fitted in the housing.
¡These one-way clutches use the outer ring drawn
by precision deep drawing, which needs the
housing with wall thickness of a specified value or
more.
¡HF type is subjected to configuration of a radial
ball bearing at its double ends. (On the other
hand, HFL type is complete with radial bearings
built-in at its double sides.)

Bottom roller bearing ʕʕ For textile machinery ʕʕ
This is a grease pre-filled needle roller bearing
intended to support the bottom rollers. The spherical
outer surface of the outer ring can allow bottom roller
mounting error to some extent. On the other hand,
the inner ring is provided with ribs at its double ends.
A clearance between the outer ring ribs and the inner
ring ribs is kept less and, in addition, the outer
surface of each inner ring rib is knurled so as not to
allow easy invasion of mist, etc. into the bearing.

Tension Pulley ʕʕ For Textile Machinery ʕʕ
This pulley is used to guide the tapered portion or
belt of the spindle drive unit in each of a fine spinning
machine, a rough spinning machine, a pre-twisting
machine, etc. as well as to apply tension to them.
The pulley drawn from steel plate by precision deep
drawing is press-fitted on the outer ring of shaft
bearing instead of inner ring.

A-13