Y-Bearings
Y-bearings
(insert bearings) are basically deep groove ball bearings sealed at both
sides. They have a convex spherical diameter on the outer ring, and have an
inner ring extended at one or both sides. When mounted in appropriate
housings to form Y-bearing units, they compensate for initial alignment
errors.
Y-bearing units are used in agricultural machinery, construction equipment,
and conveyor systems, textile machines fans and beverage processing and
packaging machinery. Four different methods are available to locate the
bearing on the shaft:
- Grub (set) screw locking
- Eccentric locking collar with grub screw
- Adapter sleeve
- Location by interference fit
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Y-bearing units do not allow axial. The distance
between bearing positions should be short, or the units should be attached
to resilient sheet metal fabrications to prevent them from being subjected
to excessive stress.
Bearings with Grub Screw Locking
Y-bearings with grub screw locking are held in position on the shaft by two
grub screws directly in the inner ring extension. These Y-bearings are
sealed at both sides. They have two lubrication holes in the outer ring as
standard; if required, they may also be supplied without lubrication holes.
These bearings may be stainless steel or zinc plated.
Bearings with Eccentric Locking Collar
These bearings are locked on to the shaft by means of an eccentric-locking
collar fitted to the inner ring extension and secured by means of a grub
screw. Bearings with eccentric locking collar should be used where the
direction of rotation is constant. They have two lubrication holes in the
outer ring
Y-Bearings with Adapter Sleeve
Y-bearings with tapered bore mounted on adapter sleeves can be used where
the direction of rotation may remain same or alternate. This allows the
bearings to operate at higher speeds. The inner ring of the bearings
extended at both sides and has a tapered bore. The bearings are sealed at
both sides with two lubrication holes in the outer ring.
Y-bearings with standard inner ring
They have a standard-width inner ring. They are like sealed deep groove
ball bearings except that the outer ring is spherical. They do not have
lubrication holes in the outer ring.
Tolerance -
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view the table
Internal Clearance -
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the table
Seals - Since Y-bearings were developed for agricultural
equipment and, much attention has been paid to their seals.
Standard
seals consist of a pressed steel washer with a synthetic rubber lip
vulcanised to its inner surface. Washer forms a narrow gap with the
cylindrical surface of the inner ring shoulder providing protection Plain
flingers are used for harsh conditions. They have inner rings extended at
both sides, can be fitted with plain steel flingers. These flingers enhance
the sealing effect without increasing friction.
Rubberized flingers have a rubber lip vulcanized to the
inside of the flinger, which seals axially against the integral seal. The
space between the integral seal and the rubberized flinger is filled with
grease. Pressed steel non-rubbing seals called shields form a sealing gap
with the inner ring shoulders which excludes coarse solid contaminants.
There is no contact and friction is at a minimum.
The seals and rubberized flingers are suitable for operating temperatures
between -30 and +110 °C.
