BENDIX MC-12 MODULATOR CONTROLLER ASSY Guida alla Risoluzione dei Problemi Scaricare il pdf (Pagina 8)

More info: visit www.bendix.com 1-800-AIR-BRAKE (1-800-247-2725)

Section 2: The Charging System

Governor

Air Dryer

Primary

Reservoir

Safety Valve

Air Compressor

Supply

Reservoir

Secondary

Reservoir

Check Valve

Safety

Valve

Low Pressure Indicator

Purge

Valve

Drain Valve

• Safety valves to protect against excessive

pressure in the system in the event that a

charging system component malfunction occurs,

e.g. a line blockage

• Single check valves to maintain a one-way

ﬂ ow of air into the reservoirs. This arrangement

protects the contents from being drained in the

event of an upstream loss of pressure

• Low pressure indicators to alert the driver

whenever a reservoir has less than a pre-set

amount of air available

The charging system consists of:

• An air compressor, to pressurize the system

• A governor, to control when the compressor

needs to build, or stop building, air for the

system and also to control the air dryer purge

cycle

• An air dryer, to remove water and oil droplets

from the air

• Reservoirs (or “air tanks”) to store air to be used

for vehicle braking, etc.

Overview

The brake system needs a supply of compressed

air between a preset maximum and minimum. The

governor (along with a synchro valve for certain

Bendix

air compressors) monitors the air pressure in

the supply reservoir and controls when the compressor

needs to pump air into the air system (also known

as the “air build cycle” - the compressor is “running

loaded”) and when the compressor can simply turn

over without building pressure (“running unloaded”).

When the air pressure becomes greater than that of

the preset “cut-out”, the governor controls the unloader

mechanism of the compressor, stops the compressor

from building air, and causes the air dryer to purge.

As the service reservoir air pressure drops to the

“cut-in” setting of the governor, the governor returns

the compressor back to building air and cycles the air

dryer back to air drying mode.

Bendix Air Compressors

The air compressor is the source of energy for the air

brake system.

Usually driven by the vehicle engine, the air compressor

builds the air pressure for the air brake system. The

air compressor is typically cooled by the engine

coolant system and lubricated by the engine oil supply.

(Certain models have self-lubricated and/or air-cooled

versions available.) Note: Air compressor shafts can

rotate in either direction.

The vehicle’s compressor draws in ﬁ ltered air, either at

atmospheric pressure from the outside (or already at

an increased pressure from the engine turbocharger

where permitted), and compresses it until system

pressure is achieved.

Note: Although a typical

three-reservoir system is

shown here, some system

designs do not use a

Supply reservoir.

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 69 70

Commenti su questo manuale

Nessun commento

BENDIX MC-12 MODULATOR CONTROLLER ASSY Guida alla Risoluzione dei Problemi Pagina 8

Commenti su questo manuale

Prodotti e manuali riguardandi Modulatori BENDIX MC-12 MODULATOR CONTROLLER ASSY