EB & ER Tech Specs0 pages

EB and ER Construction
EB Element
EB elements are suited to slow speed
applications having moderate starting and
stopping loads. They are used as slip clutches
and tension brakes for lighter torque and
horsepower applications.
EB elements are similar in design and
construction to the CB elements and have many
of the CB features. A neoprene rubber and cord
tube is bonded on its inside diameter to a
cylindrical surface. Friction shoes are attached
with pins and held in position with lockwires to
the outside diameter of the tube. Torque is
transmitted by the sidewalls of the rubber tube.
Pressurizing the tube forces the friction shoes to
engage an inside drum diameter.
The expanding design allows the element to
behave as a centrifugal clutch. The radial
stiffness of the rubber tube determines the
element speed at which the friction shoes will
retract.
The rubber tubes of the three small elements are
bonded to the outside diameters of solid hubs,
which, in turn, are bored and keyseated for direct
shaft mounting. The pressurizing passage can be
either a radial hole thru the hub or a port
provided in the hub face. Larger element sizes
are attached to the shaft by a separate element
hub.
Copyright Eaton Corporation, 1997, All rights reserved.
ER Element
Element torque is dependent upon the applied
pressure and speed. Catalog ratings are given at
75 psi (5,2) and zero rpm. Maximum
recommended pressure is 110 psi (7,6 bar).
Adjustment for operating pressure and speed is
explained under Selection Procedure.
EB elements are available in 11 sizes. They are
identified by the inside drum diameter in inches
to which they expand and the width in inches of
their friction lining. For instance, size 16EB475 is
designed to expand to a 16 inch diameter drum
and has a friction lining width of 4.75 inches.
The smallest EB element will expand to a 4 inch
(102 mm) diameter drum and the largest to a 24
inch (610 mm) diameter drum. Due to its small
diameter, the 4EB125 does not have replaceable
friction shoes. Instead, the friction material is
bonded to its rubber tube.
Construction of the ER element is similar to the
EB element, except for friction shoes. ER
elements engage their drums directly with the
outside rubber surface of their actuating tubes.
This interface results in a friction force which
provides a large torque in a relatively small
package. It also provides electrical isolation
between connecting shafts.
ER elements are used as shaft couplings or
holding brakes where engagement occurs at
zero speed differential between element and
drum. They are ideal for applications in which a
disconnect is required without stopping the
prime mover or in which the driving and or
driven equipment must be frequently withdrawn
from the drive.
ER elements are identified similar to the EB
elements. They are available in ten sizes. The
smallest expands to a 3 inch (51 mm) diameter
drum and the largest to a 24 inch (610 mm)
diameter drum.
Where Used:
•
Centrifuges
•
Core Expanders
•
Laundry Machines
•
Textile Machines
•
Tire Building Machines
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