Introduction; Description; How It Works; Installation - Danfoss Airflex DBBS Installation, Operation And Maintenance Manual

DBBS Brakes
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 equipment. Three signal words
"DANGER", "WARNING", and "CAUTION" are used
to indicate the severity of a hazard, and are preceded
by the safety alert symbol .
Danger
Denotes the most serious hazard, and is used when
serious injury or death WILL result from misuse or
failure to follow specific instructions.
Warning
Used when serious injury or death MAY result from
misuse or failure to follow specific instructions.
Caution
Used when injury or product / equipment damage
may result from misuse or failure to follow specific
instructions.
It is the responsibility and duty of all personnel
involved in the installation, operation, and
maintenance of the equipment on which this device
is used to fully understand the ! Danger ! Warning
and ! Caution procedures by which hazards are to be
avoided.
1.1

Description

1.1.1 The Airflex Model DBBS brakes were designed for
heavy-duty industrial applications where spring set
(power o ) braking is required.
1.1.2 All Airflex DBBS brakes are supplied with long
wearing, Non-Asbestos Friction material and solid
cast, rotating discs.
1.1.3 Airflex DBBS brakes are available in four basic
sizes and can be supplied as single, dual, triple or
quadruple disc units. The model number identifies
the number of discs and the disc diameter. For
example, 225DBBS indicates the brake uses two 25
inch diameter discs. When size, such as 25DBBS
is referred to in this manual, it means that the
information given applies to all DBBS models using
25 inch diameter discs; i.e. 125DBBS, 225DBBS,
etc...
6 Airflex DBB 8110 Brake Assembly
®
1.1.4
1.2
1.2.1
1.2.2
2.0
2.1
2.1.1
E-CLCL-TT001-E December 2012
This manual includes metric equivalents usually
shown in parentheses ( ) following the U.S.
measurement system value. Be sure to use the
correct value.

How It Works

Referring to Figure 1 and Table 1, the gear (28) is
mounted on the shaft which is to be stopped. The
brake assembly is attached to the machine frame or
reaction bracket. As air pressure is applied through
the ports in the cylinder (19), the cylinder and
pressure plate (14), which are attached to each
other with screws (20), flat washers (17) and spacer
tubes (2 7), move away from the mounting flange (2),
which is connected to the machine frame or reaction
bracket. The pressure plate compresses the springs
(22) (52) against the stationary spring housing (16)
and the clamp force is removed from the discs (58)
which ride on the gear. The shaft is then free to
rotate.
As air pressure is exhausted, the springs (22) force
the pressure plate (14) toward the mounting flange
(2), clamping the rotating discs (58) between the
stationary friction discs (8) which are attached to the
pressure plate (14) and mounting flange (2). On two,
three and four disc models, a reaction plate (31), to
which friction discs are mounted, and an additional
disc are clamped between the pressure plate and
mounting flange.

Installation

Danger
Prior to installation of the DBBS brake, make sure
that the machinery will remain in a secured position.
Failure to do so could result in serious personal injury
or possibly death.

Alignment

For proper operation and service life, the DBBS brake
must be mounted concentric and at right angles to
the shaft within the limits shown on Table 2.
CAUTION
Proper alignment is necessary to assure that the
discs (58) will track properly. Improper alignment will
result in excessive wear to the friction discs (8), discs
(58) and gear (28). See Figure 2.