Bendix-commercial-vehicle-systems ROTOCHAMBERS User Manual download pdf

Rotochambers

SD-02-1336

OUTER

DIAPHRAGM

CLAMP

PUSH ROD

ASSY.

INNER

DIAPHRAGM

CLAMP

BODY

BOOT

SPRING

COVER

MOUNTING STUD

DIAPHRAGM

LOCK NUT

YOKE ASSY.

DIAPHRAGM

GUIDE

DESCRIPTION

The rotochamber is an actuator which converts the energy

of air pressure into mechanical force. The type number of

the rotochamber indicates the actuator’s diaphragm effective

area (Type 30 - 30 sq. in. of diaphragm) and the various

sizes available give a wide range of output force and length

of stroke. The rolling type diaphragm provides long life and

gives a constant output force throughout the entire stroke.

One end of the diaphragm is clamped to the inside wall of

the body by the outer clamp. The other end of the diaphragm

is clamped between the diaphragm guide and inner

diaphragm clamp. The cover is fastened to the outer body

by cap screws. Mounting studs are used to mount the

chambers. A boot retained by a boot retainer is used to

prevent entrance of moisture through the hole in the cover.

A lock nut and yoke with pin are screwed on the threaded

push rod. Most rotochambers now have 3/8 in. NPTF inlet

ports. The long stroke Type 50 employ a 1/2 in. NPTF inlet

port.

OPERATION

Controlled air pressure enters the rotochamber through the

inlet port and acts upon the diaphragm, moving the diaphragm

guide and diaphragm forward. The diaphragm moves along

the inside wall of the cylinder body with a smooth rolling

motion. The forward motion of the diaphragm guide and

diaphragm forces the push plate and push rod forward.

When the rotochamber is used to actuate cam type foundation

brake assemblies, the yoke is connected to a slack adjuster

which in turn is connected to the brake cam shaft. This

forward motion of the push rod rotates the slack adjuster,

cam shaft and cam applying the vehicle brakes.

The rotochamber is also used in industrial applications and

in such cases may be used in clamping or holding

operations.

The greater air pressure admitted to the rotochamber, the

greater the force applied by the push rod and, conversely,

the less air pressure applied to the rotochamber, the less

force applied by the push rod. Push rod force is determined

by multiplying the air pressure delivered by the effective

diaphragm area. For example, if 60 psi is admitted to the

Type 30 rotochamber the lineal force on the end of the push

rod is approximately 1800 lbs.

When air pressure is released from the rotochamber the

rotochamber spring returns the slack adjuster (if applicable),

push rod, diaphragm guide and diaphragm to the released

position.

1 2 3 4

Summary of Contents

Page 1 - Rotochambers

1®RotochambersSD-02-1336 OUTERDIAPHRAGMCLAMPPUSH RODASSY.INNERDIAPHRAGMCLAMPBODYBOOTSPRINGCOVERMOUNTING STUDDIAPHRAGMLOCK NUTYOKE ASSY.DIAPHRAGMGUIDED

Page 2

2PREVENTIVE MAINTENANCEA. Every month, 8,000 miles, or after 300 operating hours,depending on type of operation:1. Check push rod travel and adjust tr

Page 3 - PERSONAL INJURY OR DEATH:

3ASSEMBLY1. Position the diaphragm on end in the inner diaphragmclamp. The smaller diameter end of the diaphragm shouldbe against the diaphragm clamp.

Page 4

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Bendix-commercial-vehicle-systems ROTOCHAMBERS User Manual

Browse online or download User Manual for Equipment Bendix-commercial-vehicle-systems ROTOCHAMBERS. Bendix Commercial Vehicle Systems ROTOCHAMBERS User Manual [en]

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