Oil Pump - wsm BX1800 Workshop Manual

BX1800 · BX2200, WSM

[1] OIL PUMP

D722-E-BX
The oil pump is a trochoid pump.
Inside the pump body, the 4 lobe inner rotor (2) is
eccentrically engaged with the 5 lobe outer rotor (1). The
inner rotor is driven by the crankshaft, which in turn rotate
the outer rotor.
When the inner rotor rotates, the outer rotor also
rotates in the same direction.
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.
discharged from the outlet port.
(1) Outer Rotor
(2) Inner Rotor
D905-E-BX
The oil pump is a trochoid pump.
Inside the pump body, the 10 lobe inner rotor (2) is
eccentrically engaged with the 11 lobe outer rotor (1).
The inner rotor is driven by the crankshaft, which in turn
rotate the outer rotor.
When the inner rotor rotates, the outer rotor also
rotates in the same direction.
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 (3). As the rotors rotate, the space between
the lobes becomes larger, creating a negative pressure
which sucks in oil.
When the rotors rotate to position (B), the port to
which the space leads is changed from inlet to outlet.
At position (C), the space decreases and sucked oil is
discharged from the outlet port (4).
(1) Outer Rotor
(2) Inner Rotor
1-M9
ENGINE
The two rotors have
At position (D), oil is
(3) Inlet Port
(4) Outlet Port
W1015262
The two rotors have
(3) Inlet Port
(4) Outlet Port
W1015536
KiSC issued 07, 2006 A