BENDIX ATR-1 ANTILOCK TRACTION RELAY Руководство - Страница 2
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CONTROLLER
ATR-1
ANTILOCK
™
TRACTION RELAY
VALVE
FIGURE 2 - ANTILOCK TRACTION ASSEMBLY
OPERATION
GENERAL
Because the ATR-1
is essentially a relay valve, the following
™
description of operation refers to its function in the vehicles
air brake system and does not address all of the separate
SOLENOID
CONNECTOR
BLEND BACK
PISTON
SUPPLY
FIGURE 3 - ATR-1
ANTILOCK TRACTION ASSEMBLY
™
2
antilock components and their operation. For a description
of antilock operation, refer to the appropriate Service Data
Sheet covering the electronic controller used with the
ATR-1
valve.
™
SERVICE BRAKES APPLYING (FIGURE 4)
Reservoir air pressure is present at the supply port and flows
through internal body and cover passages to the supply of
the normally closed (NC) traction control solenoid.
Brake application air enters the ATR-1
and is conducted to the single check valve. The check valve
diaphragm flexes in response to application pressure and
seals the passage to the open exhaust of the traction
solenoid. Air flows through the service piston then through
the center of the blend back and through a passage in the
cover to the top of the service relay piston. In response to air
pressure, the relay piston moves into contact with the
exhaust portion of its inlet and exhaust valve. With the
exhaust passage sealed, continued movement of the piston
unseats the inlet portion of the inlet and exhaust valve,
allowing supply air from the reservoir to flow out the ATR-1
valve's delivery ports to the brake chambers.
TRACTION CONTROL
SOLENOID
EXHAUST
™
valve's service port
SERVICE
DOUBLE
CHECK VALVE
RELAY PISTON
INLET-EXHAUST
VALVE
DELIVERY
™