1.0
INTRODUCTION
Throughout this manual there are a number of
HAZARD WARNINGS that must be read and
adhered to in order to prevent possible personal
injury and/or damage to the equipment. Three
signal words "
DANGER
", "
WARNING
", and
"
CAUTION
" are used to indicate the severity of
the hazard, and are preceded by the safety alert
symbol .
Denotes the most serious injury hazard,
and is used when serious injury or
death WILL result from misuse or
failure to follow specific instructions.
Used when serious injury or death
MAY result from misuse or failure to
follow specific instructions.
Used when injury or product/equipment
damage may result from misuse or
failure to follow specific instructions.
It is the responsibility and the duty of all per-
sonnel involved in the installation, operation
and maintenance of the equipment on which
this device is used to fully understand the
, ,
and
procedures
by which hazards are to be avoided.
1.1
Description
1.1.1
The Airflex WCB2 water-cooled tensioner is
designed for constant tension applications. It
is exceptionally well suited for high inertia
stopping and rapid heat dissipation. The
design of the WCB2 tensioner permits mid-
shaft or end-shaft mounting. The rugged con-
struction ensures long, trouble free service.
1.1.2
WCB2 tensioners are available in various sizes
and quantities of friction discs. The model num-
ber identifies the number of discs and the nomi-
nal disc diameter. For example, 324WCB2
indicates three 24" diameter discs.
1.1.3
When size, such as 36WCB2, is referred to
in this manual, it means that the informa-
tion given applies to all models using the
36" diameter water-cooled disc assembly;
i.e., 236WCB2, 336WCB2, etc.
1.1.4
Tensioners can be used with either closed
loop or open loop water systems.
1.1.5
This manual includes metric equiva-
lents usually shown in brackets (#)
following the U.S. measurement
system value. Be sure to use the
correct value.
1.2
How It Works
1.2.1
Referring to Figure 1, the gear (28) is
mounted on the shaft which is to be
stopped and the tensioner assembly
is attached to the machine frame or
a reaction bracket.
Air pressure is applied through the ports in
the cylinder (19) causing the piston (33)
and pressure plate assembly (13) to move
towards the mounting flange, compressing
the release springs. As the applied
pressure increases, the friction disc(s) are
clamped between the pressure plate and
mounting flange, stopping or controlling
the shaft the discs are mounted on.
Modulation of air pressure then controls
applied torque of the tensioner. Multiple
disc brakes utilize reaction plates (30)
between discs. The release springs (34)
assist in disengagement and retraction of
the piston, pressure plate, and reaction
plates, if applicable. High heat dissipation
is accomplished by passing water through
a special cavity behind the copper alloy
wear plates.
Torque flows through the brake from the
shaft to be controlled, through the friction
discs, through the pressure plate and
reaction plates, through the clamp tubes
and studs, to the mounting flange, which
is attached to a rigid surface.
WCB 11070 VP 4.2 Format
5
© Copyright Eaton Corp., 2003. All rights reserved
April 2002 (Revised June 2003)
