Page 28 - Y-bearing-units

Selection of Y-bearing unit type

Loads Fig. 2

The magnitude of the load is the factor that
usually determines the size of the Y-bearing
unit to be used. Generally, units with housings
made from grey cast iron or composite material
can withstand heavier loads than units with
pressed sheet steel housings. Magnitude of load
is defined as:
• P ≤ 0,02 C – very light load
• 0,02 C < P ≤ 0,035 C – light load
• 0,035 C < P ≤ 0,05 C – moderate load
• 0,05 C < P ≤ 0,1 C – normal load
• P > 0,1 C – heavy load

Radial loads
In applications where normal to heavy loads
occur, only Y-bearing units with housings made
from grey cast iron or composite material should
be used. These units are able to withstand the
same dynamic and static loads as their insert
bearings and are less sensitive to shock loads
(† fig. 2a).
Y-bearing units with a pressed steel housing
are designed to withstand light to moderate loads
and are not able to accommodate shock loads a b
(† fig. 2b).

Axial loads
The axial load carrying capacity of a Y-bearing
depends not as much on its internal design as
on the way it is locked onto the shaft († fig. 2c)
as described in the chapter Axial load carrying
ability, page 34. In general, Y-bearing units with
housings made from grey cast iron or composite
material are more suitable for heavier or alter -
nat ing axial loads.
Y-bearing units with a pressed sheet steel
housing are only intended for light axial loads, in
particular the plummer block units incorporating
a rubber seating ring († fig. 2d).

c d

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