CB0 pages

CB Construction

Single Flange Element
The type CB element assembly is designed
and built to provide dependable clutch or
brake service in the most exacting industrial
applications. It is suited to high speed,
cyclic operations, as well as for coupling
and general power transmission.
CB design, construction and operation is
quite simple. A neoprene rubber tube
reinforced with several plys of cord is
bonded on its outside diameter to a steel
rim. Friction shoes are attached to the
tube’s inside diameter by pins which in turn
are held in position by lockwires, except for
sizes 3CB150 through 5CB200 which have
friction material bonded to the rubber tube.
Pressurizing the tube forces the friction
shoes to engage around a cylindrical drum.
Element torque capacity is dependent upon
the applied pressure and rotating speed.
Catalog ratings are given at 75 psi (5.2 bar)

B-5

Dual Flange Element

and zero rpm. Maximum recommended
pressure is 110 psi (7.6 bar). Adjustment
for speed is explained under Selection
Procedure.

16CB500 and larger have rims with two
flanges. CB elements are grouped and
described as being single flanged or dual
flanged elements.

CB elements are available in 20 sizes which
are identified by the drum diameter in
inches on which they constrict and the
width in inches of its friction lining. For
instance, size 16CB500 is designed to
constrict on a 16 inch diameter drum and
has a friction lining width of 5 inches. The
smallest CB element will constrict on a 3
inch (76mm) diameter drum and the largest
on a 45 inch (1143mm) diameter drum.

Two dual flanged elements can be bolted
together to form a dual element having
twice the torque capacity of a single
element. Dual elements can be furnished in
sizes 12CB350 through 45CB525.

Element sizes 3CB150 through 10CB300
have rims with one flange. Element sizes
12CB350 and 14CB400 are normally
furnished with rims having one flange;
however, they can also be furnished, when
specified, with two flanges. Element sizes

Because the rubber tube is the connecting
member between the driving and driven
shafts, the CB design offers the following
features in addition to the constricting
features described earlier in this section.

Copyright Eaton Corporation, 1995, All rights reserved.