M.2 LUBRICATING
SYSTEM
92.4mrn STROKE
SERIES
WSM,O1092
[21
OIL
PUMP
0321F007
[3]
RELIEF VALVE
QQQ
I
A109F012
The oil pump
in
this
engine
is
a trochoid pump.
Inside the pump body, the
4
lobe inner rotor
(3)
is
eccentrically engaged
with
the
5
lobe outer rotor
(4).
The inner rotor
is
driven by
the
crankshaft via gears,
which
in
turn rotate the outer rotor.
When the inner rotor rotates, the outer rotor also
rotates
in
the same direction.
The two rotors have differences
in
lobe number
and center, which generates space between lobes as
shown
in
the figure.
At position (A), there
is
little
space between lobes
in
the inlet port. As the rotor rotates towards
position (B), the space between the lobes becomes
larger, creating a negative pressure which sucks
in
oil.
Outside the inlet port, as shown
in
position
(C),
the
space between the lobes becomes gradually smaller,
and oil pressure increases. At position
(D),
oil
is
discharged from the outlet port.
(1)
Inlet
(2)
Outlet
(3)
Inner
Rotor
(4)
Outer Rotor
The relief valve prevents the damage of
the
lubricating system due to high oil pressure.
This
relief
valve
is
a ball type direct acting relief valve, and
is
best suited for low pressures.
When oil pressure exceeds the upper limit, the ball
(3)
is
pushed back by the pressure oil and the
oil
escapes.
(1) Spring
(2)
Valve
Seat
(3)
Ball
M-11
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