Cages design
The
main requirements to a cage:
-
to
separate antifriction pieces so that
heat
release would be minimum;
-
to keep pieces at equal distance from each other to distribute
the load
among
them evenly;
-
to
keep rolling element from fallout in
separable and support-rotary bearings;
-
to
transfer
rolling
elements
(balls and
rollers)
to
the bearing area without a
load;
Bearings cages are divided into: pressed metal cage and massive cages. The less weight of pressed sheet metal cages is an advantage over massive metal cages.
Pressed
cages use to a less extent the
space
between
the
inner and outer rings, so grease penetrates into bearings easier. Since
the instrument to stamp cages is the most expensive, such types of cages
are used in mass
production of bearings. Massive metal and textolite
cages are made by methods of machining. Massive metal cages are applied
first of all in the production of large size bearings which are manufactured
in small
lots.
Massive
metal cages are also applied in case of stringent
requirements to cages hardness as
well as at high temperature in the assembly unit. In order
to provide smooth operation
of bearings with massive cages, the cages are based
by
the rib of one of the rings.
Such
types of cages are most of all applied in high-speed bearings. In this
case they are manufactured from light materials, such as light metal and
textolite to reduce inertial loads.
Massive
polyamide cages are produced by die casting. First
of all they are intended for large-scaled production. With the help
of die casting, a special form of the cage can be made that to a great
extent promotes creating a bearing with high
load carrying capacity.
You can see some examples of antifriction bearing cages design:
-
pressed steel cages for radial boll bearing: ribbon type
clincehed cages (a); ribbon type riveted cages (b) and cages
with upset bars;
-
massive brass cage with rivets for radial ball bearings
(c);
-
massive window type brass cages for angular-contact ball
bearings(d);
-
massive brass cage with cage bars (on rivets) for radial roller
bearings (e);
-
massive cage made of glass-fibre
reinforsed polyamid
for
single-row radial ball bearings (f);
-
massive window type cage made of glass-fibre
reinforsed polyamid for angular-contact ball bearings (g);
-
massive window type cage made of glass-fibre
reinforsed polyamid for single-row radial roller bearings (h);
