2-52
Brake work
Control valve
Spring L(37)
Orifice L(40)
P1
P2
Spring R(37)
Orifice R(40)
Spring L(31-3)
Check valve L(31-2)
Plunger(31-1)
Spring R(31-3)
Check valve R(31-2)
Plunger notch portion
Motor
M1
M2
(2)
R35Z72TM06
Then, when the control valve returns to the neutral position, the pressurized oil from the pump is
shut off and the pressures of the ports P1 and P2 become equal. Plunger (31-1) tries to be returned
to neutral position by force of spring R (37). When plunger (31-1) moves, the throttle opening of
plunger becomes small.
Piston motor tries to rotate with inertia energy (pumping action of motor) and the pressure rises on
port M2.
With the movement of plunger (31-1), the oil of spring L room flows out through orifice L (40) and
control the speed of plunger (31-1), By this movement, the shock pressure due to the inertia energy
on the port M2 is absorbed, simultaneously preventing the cavitation on the port M1.
