Relief Valve - Kubota Z400-B Handbuch

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[1) OIL PUMP
The oil pump is a gear 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 di­
rection, varying the space between the lobes.
While the rotors rotate from (A) to
(S),
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
(e),
the connection to the space
switches from the inlet port to the outlet port.
At
(D),
the space decreases and the sucked oil is discharged
from the outlet port.
(1) I
nlet Port
(2) Outlet Port
(3)
Inner Rotor
(4)
Outer Rotor
[2] RELIEF VALVE
The relief valve prevents damage to the lubricating system
due to the high pressure of the oil.
The relief valve is a ball type direct acting one, 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
(2)
Ball
(3) Valve Seat
M·15