47
Superior
Technology
Fuel system
Functional description
Fuel intake
The vane pump sucks in the fuel and forces it into
the pump housing. The rotor is mounted directly
on the drive shaft. A pressure control valve is
fitted for the purpose of maintaining the pressure
increase within the permissible range as the
engine speed increases.
Filling high pressure chamber
With the aid of a claw clutch, the drive shaft of
the vane pump causes the distributor piston to
rotate and lift by means of an eccentric disc. The
eccentric disc executes one lift movement per
cylinder. During the delivery phase, the control
slot opens the feed channel as the result of the
rotary motion of the distributor piston and allows
fuel to flow into the high pressure chamber.
Start of injection
The distributor piston continues to turn so that the
control slot closes the feed hole.
The following list movement exerts pressure on
the fuel. As the distributor piston continues to
rotate, the distributor groove is aligned flush with
the outlet hole. The fuel under high pressure is
forced to the injection nozzle.
MSSP_001_039
MSSP_001_037
MSSP_001_038
Distributor
piston
High pressure chamber
Distributor
groove
Distributor channel
Control slot
Vane pump
Pressure control
valve
Summary of Contents for SDI 55-5
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