M.2
LUBRICATING SYSTEM
68
mm
STROKE
SERIES
WSM,
01
160
[21
OILPUMP
db
C047F014
I
(1)
Inlet Port
(2)
Outlet Port
231
RELIEF
VALVE
(3)
Inner
Rotor
(4)
Outer Rotor
0109F026
[4]
OIL FILTER CARTRIDGE
Q
The oil pump
is
a
trochoid pump, whose rotors
have trochoid lobes.
The
inner rotor
(3)
has
4
lobes
and
the
outer rotor
(4)
has
5
lobes, and they are
eccentrically engaged with each other. The inner
rotor, which
is
driven by the crankshaft through the
gears, rotates the outer rotor
in
the same direction,
varying
the
space between the lobes.
While the rotors rotate from (A) to
(B),
the space
leading to the
inlet
port increases, which causes the
vacuum to suck in the
oil
from
the
inlet
port.
When the rotors rotate to
(C),
the space between
both rotors switches from the
inlet
port to the outlet
port.
At
(D),
the
space decreases and
the
sucked oil
is
discharged from
the
outlet port.
The relief valve prevents the damage to
the
lubricating system due to
the
high pressure of
the
oil.
The
relief valve
is
ball direct acting type, and
is
best suited for low pressures.
When the pressure of
the
oil, forced by the pump,
exceeds the specified value,
the
oil pushes back the
ball
(2)
and escapes to
the
oil pan.
(1)
Spring
(3)
Valve Seat
(2)
Ball
0
109F028
I
0109F029
M-11
After lubricating, the lubricating oil brings back
various particles of grit and dirt to the oil pan. Those
particles and
the
impurities
in
the lubricating oil can
cause wear or seizure of
the
engine parts.
It
may also
impair
the
physical and chemical properties of
the
oil
itself.
The lubricating oil which
is
force-fed by
the
pump,
is
filtered by the filter cartridge with
the
filter element
(2).
When
the
filter element accumulates on
excessive
amount
of
dirt and
the
oil pressure in the
inlet
line
builds up by
98
kPa
(1.0
kgflcm2,
14
psi)
more than the outlet line, the bypass valve
(1)
opens
to allow the
oil
to flow from the inlet into the outlet
line, bypassing the filter element.
(1)
Rypasr Valve
(2)
Filtcr
Elcmcnt
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