Pajero II Technical Information Manual 1991 · PYJE9002 PAJERO 91 TIM 1 · страница 65 из 71 · Открыть оригинал PDF ↗

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MOTOR-DRIVEN VACUUM PUMP ASSEMBLY CONSTRUCTION

The motor-driven vacuum pump assembly consists
of adiaphragm type vacuum pump driven by a DC
motor and two solenoid valves (control valve and
release valve) , and the rotations of the DC motor are
varied to the diaphragm back and forth action by the
eccentriccam and rod_
When the diaphragm moves in the direction (down
in the figure below) to increase the capacity of the
pump operating chamber, the intake valve is OPEN
and the discharge valve is CLOSED so the air in the
lineissuckedintothe
negativepressurepump
operating chamber.

Next; when the diaphragm moves in the direction
(up in the figure below) to decrease the capacity of
the pump operating chamber, the discharge valve is

OPEN and the intake valve is CLOSED, releasing the
air in the pump operating chamber to the atmos-
phereIn this way, the negative pressure is gener-
ated by sucking the air in the negative pressure line
into the pump operating chamber and releasing the
air in the pump operating chamber to atmosphere
Whennocurrent flows inthesolenoidcoil,the
solenoid valve plunger set in the negative pressure
line is returned by the return spring, the line hole in
the core opensand the negativepressurelineis
openedto the atmosphere
When current flows in the solenoid coil, the coil is
energized to pull the plungerthe line hole in the
core is closed and the negative pressure line is cut
off fromthe atmosphere

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