Bendix Commercial Vehicle Systems 360CC SINGLE CYLINDER COMPRESSOR - Manual (Page 3)

3
NON-COMPRESSION OF AIR (UNLOADED)
COMPRESSOR AND AIR DRYER SYSTEM
(REFER TO FIGURE 6)
Air delivery to the vehicle’s air system is controlled by the
governor and the air dryer, or with a separate discharge line
unloader valve. The governor is plumbed to the component
(e.g. air dryer or DLU valve) in order to control when the
air is delivered to the vehicle’s air system.
When air pressure in the supply reservoir reaches the cutout
setting of the governor, the governor delivers system air to
the discharge line unloader style (DLU) air dryer’s control
port. This allows the discharge air from the compressor to
fl ow out the exhaust port of the air dryer.
Note: The 360cc compressor is a discharge line unloader
style unit. This means that the compressor functions in a
continuous pumping mode regardless whether the brake
system requires air. It requires a downstream device (e.g.
turbo cut-off style air dryer and discharge line unloader
valve) to unload the system when the air system has
suf
fi cient stored compressed air.
LUBRICATION
The vehicle’s engine provides a continuous supply of oil
to the compressor. Oil is routed from the engine to the
compressor’s oil inlet. Note: There is no external oil supply
line; the oil delivery is located at the engine to compressor
mounting face. This pressurized oil
fl ows to the precision
front sleeve main bearing, and via an oil passage in the
crankshaft routes pressurized oil to the connecting rod
bearings and the rear journal associated with the end cover.
Spray lubrication of the cylinder bore and connecting rod
wrist pin bushing is obtained as oil is forced out around the
crankshaft journals by engine oil pressure. Oil then falls to
the bottom of the compressor crankcase and is returned to
the engine through the opening at the compressor mounting
fl ange.
COOLING
The 360cc Single Cylinder Compressor is cooled by air
fl owing through the engine compartment as it passes the
compressor’s cast-in cooling
fi ns and by the fl ow of engine
coolant through the cylinder head assembly and the water
jacket around the cylinder bore of the crankcase. Coolant
supplied by the engine cooling system passes through
connecting lines into the cylinder head, cooling plate,
valve plate assembly, into the crankcase water jacket and
returns through the same components, out of the coolant
outlet port of the cylinder head and returns to the engine.
Figure 7 illustrates the approved coolant
fl ow connections.
Proper cooling is important in minimizing discharge air
temperatures – see the tabulated technical data on page 11
of this manual for speci
fi c requirements.
21
22
S
D
S
C
UNL
Compressor
Governor
Air Dryer
FIGURE 6 - TYPICAL 360 (DLU) COMPRESSOR AIR CHARGING SYSTEM
Front Service
Reservoir
Rear Service
Reservoir
DLU Valve
FIGURE 5 - OPERATION - COMPRESSION
Piston Moving Up
Air Inlet
Port
Inlet
Valve
Closed
Air
Discharge
Port
Discharge
Valve
Open
Valve
Plate
Cooling
Plate